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class="mw-redirectedfrom">(Ailgyfeiriad o <a href="/w/index.php?title=Cyfrifiad_2011&redirect=no" class="mw-redirect" title="Cyfrifiad 2011">Cyfrifiad 2011</a>)</span></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="cy" dir="ltr"><b></b><table class="infobox" style="font-size: 90%; text-align: left; width: 19em;"> <caption><big><b>Cyfrifiad y Deyrnas Unedig 2011</b></big> </caption> <tbody><tr> <td align="center" colspan="2"><span typeof="mw:File"><a href="/wiki/Delwedd:Logo_Cyfrifiad_2011.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/cy/thumb/f/fc/Logo_Cyfrifiad_2011.svg/215px-Logo_Cyfrifiad_2011.svg.png" decoding="async" width="215" height="215" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/cy/thumb/f/fc/Logo_Cyfrifiad_2011.svg/323px-Logo_Cyfrifiad_2011.svg.png 1.5x, //upload.wikimedia.org/wikipedia/cy/thumb/f/fc/Logo_Cyfrifiad_2011.svg/430px-Logo_Cyfrifiad_2011.svg.png 2x" data-file-width="250" data-file-height="250" /></a></span> </td></tr> <tr> <th>Cyfrifiad blaenorol </th> <td><a href="/wiki/Cyfrifiad_y_Deyrnas_Unedig_2001" title="Cyfrifiad y Deyrnas Unedig 2001">Cyfrifiad y Deyrnas Unedig 2001</a> </td></tr> <tr> <th>Cyfrifiad nesaf </th> <td><a href="/wiki/Cyfrifiad_y_Deyrnas_Unedig_2021" title="Cyfrifiad y Deyrnas Unedig 2021">Cyfrifiad y Deyrnas Unedig 2021</a> </td></tr> <tr> <th>Ardal </th> <td><a href="/wiki/Deyrnas_Unedig" class="mw-redirect" title="Deyrnas Unedig">Deyrnas Unedig</a> </td></tr> <tr> <th>Awdurdod </th> <td><a href="/wiki/Swyddfa_Ystadegau_Gwladol" title="Swyddfa Ystadegau Gwladol">Swyddfa Ystadegau Gwladol</a> </td></tr> <tr> <th>Dyddiad y Cyfrifiad </th> <td><a href="/wiki/27_Mawrth" title="27 Mawrth">27 Mawrth</a> <a href="/wiki/2011" title="2011">2011</a> </td></tr> </tbody></table> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/Delwedd:Call_yourself_Cornish.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/41/Call_yourself_Cornish.jpg/220px-Call_yourself_Cornish.jpg" decoding="async" width="220" height="295" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/41/Call_yourself_Cornish.jpg/330px-Call_yourself_Cornish.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/41/Call_yourself_Cornish.jpg/440px-Call_yourself_Cornish.jpg 2x" data-file-width="517" data-file-height="694" /></a><figcaption>Hysbyseb yng Nghernyw ar sut i nodi eu cenedligrwydd Cernyweg yng Nghernyw.</figcaption></figure> <p>Cynhaliwyd <a href="/wiki/Cyfrifiad" title="Cyfrifiad">cyfrifiad</a> ym mhob rhan o'r DU, a adnabyddir yn gyffredinol fel <b>Cyfrifiad 2011</b>, ar ddydd Sul <a href="/wiki/27_Mawrth" title="27 Mawrth">27 Mawrth</a> <a href="/wiki/2011" title="2011">2011</a>. Hwn oedd yr 20fed cyfrifiad yn y Deyrnas Unedig. Trefnwyd y Cyfrifiad gan y <a href="/wiki/Swyddfa_Ystadegau_Gwladol" title="Swyddfa Ystadegau Gwladol">Swyddfa Ystadegau Gwladol</a> yng Nghymru a Lloegr a gan Swyddfa Gofrestru Gyffredinol yr Alban yn yr Alban a gan Asiantaeth Ystadegau ac Ymchwil Gogledd Iwerddon yng Ngogledd Iwerddon. Mae canlyniadau manwl yn ôl ardal, ardal cyngor, ward ac ardal allbwn ar gael ar eu gwefannau perthnasol. </p><p>Rhyddhawyd y canlyniadau cyntaf, sef amcangyfrifon am oedran, rhyw a deiliaid tai, ar 16 Gorffennaf 2012.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>, a dilynwyd hyn gyda gwybodaeth manylach ar 11 Rhagfyr 2012.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> Daw rhagor o fanylion yn y misoedd hyd at Hydref 2013. </p><p>Y ddau fater llosg sy'n deillio o'r wybodaeth hon parthed Cymru yw: lleihad yn y niferoedd sy'n siarad Cymraeg a lleihad yn y niferoedd sy'n nodi eu crefydd fel "Cristion". </p> <div class="mw-heading mw-heading2"><h2 id="Y_Gymraeg">Y Gymraeg</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Cyfrifiad_y_Deyrnas_Unedig_2011&veaction=edit&section=1" title="Golygu'r adran: Y Gymraeg" class="mw-editsection-visualeditor"><span>golygu</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Cyfrifiad_y_Deyrnas_Unedig_2011&action=edit&section=1" title="Edit section's source code: Y Gymraeg"><span>golygu cod</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Bu cwymp yng nghanran poblogaeth y dinasyddion a nododd eu bont yn siarad Cymraeg, a chwympodd y nifer absoliwt hefyd. Y gwahaniaeth rhwng y ddau rif yma ydy'r cynnydd a welwyd yn y nifer o <a href="/wiki/Mewnlifiad" class="mw-redirect" title="Mewnlifiad">bobl ddwad</a> neu fewnlifiad o wledydd eraill i Gymru. Canfyddwyd: </p> <ul><li>Bu cwymp (neu "leihad") o 9% yng nghanran y boblogaeth sy'n siarad Cymraeg (o 20.8% i 19.0%, sef 1.8 pwynt canran). Ond 3.5% oedd y cwymp yn nifer y siaradwyr. Mae'r ffigurau'n wahanol oherwydd twf ym mhoblogaeth Cymru. Bu cynnydd hefyd o ddau bwynt canran yn nifer y trigolion a anwyd y tu allan i'r wlad.</li> <li>Yn y De Orllewin y gwelwyd y cwymp mwyaf yn nifer y siaradwyr: yn <a href="/wiki/Sir_Gaerfyrddin" title="Sir Gaerfyrddin">Sir Gâr</a>, <a href="/wiki/Ceredigion" title="Ceredigion">Ceredigion</a>, <a href="/wiki/Castell-Nedd_Port_Talbot" class="mw-redirect" title="Castell-Nedd Port Talbot">Castell-Nedd Port Talbot</a> ac <a href="/wiki/Abertawe" title="Abertawe">Abertawe</a>. Roedd <a href="/wiki/Cyfrifiad_2001" class="mw-disambig" title="Cyfrifiad 2001">Cyfrifiad 2001</a> wedi dangos canran uchel o siaradwyr Cymraeg yn y siroedd hyn a oedd dros 65 oed, felly gellir dadlau fod rhan o'r cwymp presennol yn deillio o ostyngiad hanner canrif yn ôl yn nghanran y plant a fagwyd yn siarad Cymraeg.</li> <li>Yn y De Ddwyrain, bu i gyfran y siaradwyr Cymraeg gwympo'n sylweddol ym <a href="/wiki/Blaenau_Gwent" title="Blaenau Gwent">Mlaenau Gwent</a>, <a href="/wiki/Torfaen" title="Torfaen">Torfaen</a> a <a href="/wiki/Merthyr_Tudful" title="Merthyr Tudful">Merthyr Tudful</a>. Ar y llaw arall, cynyddodd cyfran y siaradwyr Cymraeg yng <a href="/wiki/Caerffili" title="Caerffili">Nghaerffili</a> a <a href="/wiki/Sir_Fynwy" title="Sir Fynwy">Sir Fynwy</a> rhyw fymryn. Yn ôl Cyfrifiad 2001 roedd mwyafrif y siaradwyr Cymraeg yn y siroedd hyn yn blant ysgol, ac roedd y niferoedd yn cynnwys llawer o blant nad oedd â rhiant a oedd yn medru Cymraeg ac nad oedd ychwaith yn mynd i ysgol cyfrwng Cymraeg. Gan na fu newid chwyldroadol yn nulliau dysgu Cymraeg rhwng 2001 a 2011, mae yna le i gredu fod y cwymp yn deillio o newid yn y ffordd mae rhieni yn nodi sgiliau ail iaith eu plant yn y Gymraeg ar ffurflen y Cyfrifiad, yn hytrach na newid yn arfer iaith y boblogaeth.</li> <li>Yn y Gogledd Ddwyrain yn <a href="/wiki/Sir_Ddinbych" title="Sir Ddinbych">Sir Ddinbych</a>, <a href="/wiki/Sir_y_Fflint" title="Sir y Fflint">Sir y Fflint</a> a <a href="/wiki/Wrecsam" title="Wrecsam">Wrecsam</a>, bu gostyngiad yn niferoedd y siaradwyr Cymraeg hefyd, ond i raddau llai. Bydd ystadegau wardiau yn dangos yn gliriach a yw'r ardal hon yn dilyn patrwm cyffredinol y De Orllewin neu'r De Ddwyrain.</li> <li>Yn y Gogledd Orllewin yng <a href="/wiki/Gwynedd" title="Gwynedd">Ngwynedd</a>, <a href="/wiki/M%C3%B4n" class="mw-redirect" title="Môn">Môn</a> a <a href="/wiki/Conwy_(sir)" title="Conwy (sir)">Chonwy</a>, <b>roedd nifer y siaradwyr yn weddol sefydlog</b> ond mae cynnydd yn y boblogaeth oherwydd y mewnlifiad yn golygu bod canran y siaradwyr wedi gostwng.</li> <li>Yng <a href="/wiki/Caerdydd" title="Caerdydd">Nghaerdydd</a>, cynyddodd nifer y siaradwyr yn sylweddol, ond oherwydd twf poblogaeth y brifddinas ni fu ond cynnydd bychan yn y ganran.</li> <li>Mae'r ystadegau'n dibynnu ar farn a thuedd y person a lenwodd y ffurflen wreiddiol, felly mae newid mewn agweddau tuag at y Cymraeg yn effeithio ar y canlyniadau, heb o reidrwydd adlewyrchu newid yn yr arferoedd ieithyddol. Ceir gwahaniaethau, hefyd, rhwng y cyfrifiadau gwahanol yn y cwestiynau a ofynwyd (ond nid am y Gymraeg rhwng 2001 a 2011). Am y rhesymau hyn, gall cymharu'r union ffigurau'n uniongyrchol fod yn gamarweiniol.</li></ul> <table class="wikitable sortable" style="text-align:right"> <tbody><tr> <th>Ardal</th> <th>Siarad Cymraeg 2001</th> <th>Siarad Cymraeg 2011</th> <th>Newid, Nifer</th> <th>Cyfran Siaradwyr</th> <th>Poblogaeth ≥ 3 Oed, 2001</th> <th>Poblogaeth ≥ 3 Oed, 2011</th> <th>Newid, Pwynt Canran o'r Boblogaeth </th></tr> <tr> <td>Ynys Môn </td> <td>38,893 </td> <td>38,568 </td> <td>-325 </td> <td data-sort-value="049991">colli un o bob <b>119</b> siaradwr </td> <td>64,679 </td> <td>67,403 </td> <td>-2.91% </td></tr> <tr> <td>Gwynedd </td> <td>77,846 </td> <td>77,000 </td> <td>-846 </td> <td data-sort-value="049989">colli un o bob <b>92</b> siaradwr </td> <td>112,800 </td> <td>117,789 </td> <td>-3.64% </td></tr> <tr> <td>Conwy </td> <td>31,298 </td> <td>30,600 </td> <td>-698 </td> <td data-sort-value="049977">colli un o bob <b>44</b> siaradwr </td> <td>106,316 </td> <td>111,724 </td> <td>-2.05% </td></tr> <tr> <td>Sir Ddinbych </td> <td>23,760 </td> <td>22,236 </td> <td>-1524 </td> <td data-sort-value="049935">colli un o bob <b>15</b> siaradwr </td> <td>90,085 </td> <td>90,527 </td> <td>-1.81% </td></tr> <tr> <td>Sir y Fflint </td> <td>20,599 </td> <td>19,343 </td> <td>-1256 </td> <td data-sort-value="049939">colli un o bob <b>16</b> siaradwr </td> <td>143,382 </td> <td>146,940 </td> <td>-1.20% </td></tr> <tr> <td>Wrecsam </td> <td>18,105 </td> <td>16,659 </td> <td>-1446 </td> <td data-sort-value="049920">colli un o bob <b>12</b> siaradwr </td> <td>124,024 </td> <td>129,425 </td> <td>-1.73% </td></tr> <tr> <td>Powys </td> <td>25,814 </td> <td>23,990 </td> <td>-1824 </td> <td data-sort-value="049929">colli un o bob <b>14</b> siaradwr </td> <td>122,473 </td> <td>129,083 </td> <td>-2.49% </td></tr> <tr> <td>Ceredigion </td> <td>37,918 </td> <td>34,964 </td> <td>-2954 </td> <td data-sort-value="049922">colli un o bob <b>12</b> siaradwr </td> <td>72,884 </td> <td>73,847 </td> <td>-4.68% </td></tr> <tr> <td>Sir Benfro </td> <td>23,967 </td> <td>22,786 </td> <td>-1181 </td> <td data-sort-value="049950">colli un o bob <b>20</b> siaradwr </td> <td>110,182 </td> <td>118,392 </td> <td>-2.51% </td></tr> <tr> <td>Sir Gaerfyrddin </td> <td>84,196 </td> <td>78,048 </td> <td>-6148 </td> <td data-sort-value="049926">colli un o bob <b>13</b> siaradwr </td> <td>167,373 </td> <td>177,642 </td> <td>-6.37% </td></tr> <tr> <td>Abertawe </td> <td>28,938 </td> <td>26,332 </td> <td>-2606 </td> <td data-sort-value="049909">colli un o bob <b>11</b> siaradwr </td> <td>216,226 </td> <td>231,155 </td> <td>-1.99% </td></tr> <tr> <td>Castell-nedd Port Talbot </td> <td>23,404 </td> <td>20,698 </td> <td>-2706 </td> <td data-sort-value="049884">colli un o bob <b>8</b> siaradwr </td> <td>130,305 </td> <td>135,278 </td> <td>-2.66% </td></tr> <tr> <td>Pen-y-bont ar Ogwr </td> <td>13,397 </td> <td>13,103 </td> <td>-294 </td> <td data-sort-value="049978">colli un o bob <b>45</b> siaradwr </td> <td>124,284 </td> <td>134,545 </td> <td>-1.04% </td></tr> <tr> <td>Bro Morgannwg </td> <td>12,994 </td> <td>13,189 </td> <td>195 </td> <td data-sort-value="050015">ennill un o bob <b>66</b> siaradwr </td> <td>115,116 </td> <td>122,018 </td> <td>-0.48% </td></tr> <tr> <td>Caerdydd </td> <td>32,504 </td> <td>36,735 </td> <td>4231 </td> <td data-sort-value="050130">ennill un o bob <b>7</b> siaradwr </td> <td>294,208 </td> <td>332,273 </td> <td>0.01% </td></tr> <tr> <td>Rhondda Cynon Taf </td> <td>27,946 </td> <td>27,779 </td> <td>-167 </td> <td data-sort-value="049994">colli un o bob <b>167</b> siaradwr </td> <td>223,924 </td> <td>225,555 </td> <td>-0.16% </td></tr> <tr> <td>Merthyr Tudful </td> <td>5,532 </td> <td>5,028 </td> <td>-504 </td> <td data-sort-value="049908">colli un o bob <b>10</b> siaradwr </td> <td>54,115 </td> <td>56,623 </td> <td>-1.34% </td></tr> <tr> <td>Caerffili </td> <td>18,237 </td> <td>19,251 </td> <td>1014 </td> <td data-sort-value="050055">ennill un o bob <b>17</b> siaradwr </td> <td>163,297 </td> <td>171,972 </td> <td>0.03% </td></tr> <tr> <td>Blaenau Gwent </td> <td>6,417 </td> <td>5,284 </td> <td>-1133 </td> <td data-sort-value="049823">colli un o bob <b>5</b> siaradwr </td> <td>67,795 </td> <td>67,348 </td> <td>-1.62% </td></tr> <tr> <td>Torfaen </td> <td>9,780 </td> <td>8,641 </td> <td>-1139 </td> <td data-sort-value="049883">colli un o bob <b>8</b> siaradwr </td> <td>88,062 </td> <td>87,844 </td> <td>-1.27% </td></tr> <tr> <td>Sir Fynwy </td> <td>7,688 </td> <td>8,780 </td> <td>1092 </td> <td data-sort-value="050142">ennill un o bob <b>7</b> siaradwr </td> <td>82,351 </td> <td>88,609 </td> <td>0.57% </td></tr> <tr> <td>Casnewydd </td> <td>13,135 </td> <td>13,002 </td> <td>-133 </td> <td data-sort-value="049989">colli un o bob <b>98</b> siaradwr </td> <td>131,820 </td> <td>139,849 </td> <td>-0.67% </td></tr> <tr> <th>CYMRU </th> <th>582,368 </th> <th>562,016 </th> <th>-20,352 </th> <th>colli un o bob <b>28</b> siaradwr </th> <th>2,805,701 </th> <th>2,955,841 </th> <th>-1.74% </th></tr></tbody></table> <div class="mw-heading mw-heading2"><h2 id="Cymhariaeth_gyda_Chyfrifiad_2001">Cymhariaeth gyda Chyfrifiad 2001</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Cyfrifiad_y_Deyrnas_Unedig_2011&veaction=edit&section=2" title="Golygu'r adran: Cymhariaeth gyda Chyfrifiad 2001" class="mw-editsection-visualeditor"><span>golygu</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Cyfrifiad_y_Deyrnas_Unedig_2011&action=edit&section=2" title="Edit section's source code: Cymhariaeth gyda Chyfrifiad 2001"><span>golygu cod</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul class="gallery mw-gallery-packed"> <li class="gallerybox" style="width: 274.66666666667px"> <div class="thumb" style="width: 272.66666666667px;"><span typeof="mw:File"><a href="/wiki/Delwedd:Map_1_Y_newid_rhwng_Cyfrifiad_1991_a_2001_yn_y_ganran_oedd_yn_gallu_siarad_Cymraeg,.PNG" class="mw-file-description" title="Mae'r map yn dangos sut y newidiodd y ganran a oedd yn siarad Cymraeg rhwng 1991 a 2001 ar lefel adran etholiadol."><img alt="Mae'r map yn dangos sut y newidiodd y ganran a oedd yn siarad Cymraeg rhwng 1991 a 2001 ar lefel adran etholiadol." src="//upload.wikimedia.org/wikipedia/cy/thumb/f/f5/Map_1_Y_newid_rhwng_Cyfrifiad_1991_a_2001_yn_y_ganran_oedd_yn_gallu_siarad_Cymraeg%2C.PNG/409px-Map_1_Y_newid_rhwng_Cyfrifiad_1991_a_2001_yn_y_ganran_oedd_yn_gallu_siarad_Cymraeg%2C.PNG" decoding="async" width="273" height="200" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/cy/thumb/f/f5/Map_1_Y_newid_rhwng_Cyfrifiad_1991_a_2001_yn_y_ganran_oedd_yn_gallu_siarad_Cymraeg%2C.PNG/614px-Map_1_Y_newid_rhwng_Cyfrifiad_1991_a_2001_yn_y_ganran_oedd_yn_gallu_siarad_Cymraeg%2C.PNG 1.5x, //upload.wikimedia.org/wikipedia/cy/f/f5/Map_1_Y_newid_rhwng_Cyfrifiad_1991_a_2001_yn_y_ganran_oedd_yn_gallu_siarad_Cymraeg%2C.PNG 2x" data-file-width="706" data-file-height="518" /></a></span></div> <div class="gallerytext">Mae'r map yn dangos sut y newidiodd y ganran a oedd yn siarad Cymraeg rhwng 1991 a 2001 ar lefel adran etholiadol.</div> </li> <li class="gallerybox" style="width: 162.66666666667px"> <div class="thumb" style="width: 160.66666666667px;"><span typeof="mw:File"><a href="/wiki/Delwedd:Map_2_-_Y_%25_yn_gallu_siarad_Cymraeg,_2001_B.png" class="mw-file-description" title="Y ganran a oedd yn gallu siarad Cymraeg, 2001"><img alt="Y ganran a oedd yn gallu siarad Cymraeg, 2001" src="//upload.wikimedia.org/wikipedia/cy/thumb/2/20/Map_2_-_Y_%25_yn_gallu_siarad_Cymraeg%2C_2001_B.png/241px-Map_2_-_Y_%25_yn_gallu_siarad_Cymraeg%2C_2001_B.png" decoding="async" width="161" height="200" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/cy/thumb/2/20/Map_2_-_Y_%25_yn_gallu_siarad_Cymraeg%2C_2001_B.png/362px-Map_2_-_Y_%25_yn_gallu_siarad_Cymraeg%2C_2001_B.png 1.5x, //upload.wikimedia.org/wikipedia/cy/2/20/Map_2_-_Y_%25_yn_gallu_siarad_Cymraeg%2C_2001_B.png 2x" data-file-width="406" data-file-height="505" /></a></span></div> <div class="gallerytext">Y ganran a oedd yn gallu siarad Cymraeg, 2001</div> </li> <li class="gallerybox" style="width: 182.66666666667px"> <div class="thumb" style="width: 180.66666666667px;"><span typeof="mw:File"><a href="/wiki/Delwedd:Welsh_speakers_in_the_2011_census.png" class="mw-file-description" title="Y ganran a oedd yn gallu siarad Cymraeg, 2011"><img alt="Y ganran a oedd yn gallu siarad Cymraeg, 2011" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/7e/Welsh_speakers_in_the_2011_census.png/271px-Welsh_speakers_in_the_2011_census.png" decoding="async" width="181" height="200" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/7e/Welsh_speakers_in_the_2011_census.png/406px-Welsh_speakers_in_the_2011_census.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/7e/Welsh_speakers_in_the_2011_census.png/541px-Welsh_speakers_in_the_2011_census.png 2x" data-file-width="13342" data-file-height="14791" /></a></span></div> <div class="gallerytext">Y ganran a oedd yn gallu siarad Cymraeg, 2011</div> </li> </ul> <p>Yn ystod y ddegawd hon newidiodd y ganran a oedd yn gallu siarad Cymraeg a gwelwyd cynnydd sylweddol yn awdurdodau de-ddwyrain Cymru’n arbennig ond gostwng wnaeth y canrannau yn y pedwar awdurdod a oedd â’r canrannau uchaf yn siarad Cymraeg, sef <a href="/wiki/Ynys_M%C3%B4n" title="Ynys Môn">Ynys Môn</a>, <a href="/wiki/Gwynedd" title="Gwynedd">Gwynedd</a>, <a href="/wiki/Ceredigion" title="Ceredigion">Ceredigion</a> a <a href="/wiki/Sir_Gaerfyrddin" title="Sir Gaerfyrddin">Sir Gaerfyrddin</a>. </p><p>Yn 2001 lleiafrif o 41% (239,000) o’r holl siaradwyr a oedd yn byw yn y pedair sir hynny lle roedd mwyafrif y boblogaeth yn gallu siarad Cymraeg Roedd hyn yn cymharu gyda 48% (245 mil) yn 1991. Mae dosbarthiad y siaradwyr yn amrywio’n ôl oed ac yn ôl siaradwyr rhugl. </p><p>Canlyniad y newidiadau hyn oedd bod llai o gymunedau lle roedd canrannau uchel yn gallu siarad Cymraeg er bod hefyd lai o gymunedau lle roedd canrannau isel iawn yn gallu siarad Cymraeg. </p> <div class="mw-heading mw-heading2"><h2 id="Cyfeiriadau">Cyfeiriadau</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Cyfrifiad_y_Deyrnas_Unedig_2011&veaction=edit&section=3" title="Golygu'r adran: Cyfeiriadau" class="mw-editsection-visualeditor"><span>golygu</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Cyfrifiad_y_Deyrnas_Unedig_2011&action=edit&section=3" title="Edit section's source code: Cyfeiriadau"><span>golygu cod</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="reflist" style="list-style-type: decimal;"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><a href="#cite_ref-1">↑</a></span> <span class="reference-text"> <cite class="citation web"><a rel="nofollow" class="external text" href="http://www.ons.gov.uk/ons/rel/census/cyfrifiad-2011/amcangyfrifon-o-boblogaeth-a-chartrefi-cymru/stb-cyfrifiad-2011.html">"Amcangyfrifon o Boblogaeth a Chartrefi Cymru"</a>. Swyddfa Ystadegau Gwladol<span class="reference-accessdate">. Cyrchwyd <span class="nowrap">2012-12-12</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Amcangyfrifon+o+Boblogaeth+a+Chartrefi+Cymru&rft.pub=Swyddfa+Ystadegau+Gwladol&rft_id=http%3A%2F%2Fwww.ons.gov.uk%2Fons%2Frel%2Fcensus%2Fcyfrifiad-2011%2Famcangyfrifon-o-boblogaeth-a-chartrefi-cymru%2Fstb-cyfrifiad-2011.html&rfr_id=info%3Asid%2Fcy.wikipedia.org%3ACyfrifiad+y+Deyrnas+Unedig+2011" class="Z3988"></span><style data-mw-deduplicate="TemplateStyles:r8312344">.mw-parser-output cite.citation{font-style:inherit}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .citation .cs1-lock-limited a,.mw-parser-output .citation .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .citation .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Wikisource-logo.svg/12px-Wikisource-logo.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-maint{display:none;color:#33aa33;margin-left:0.3em}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}</style></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><a href="#cite_ref-2">↑</a></span> <span class="reference-text"><cite class="citation web"><a rel="nofollow" class="external text" href="http://www.ons.gov.uk/ons/rel/census/cyfrifiad-2011/ystadegau-allweddol-ar-gyfer-awdurdodau-unedol-yng-nghymru/stb-2011-key-statistics-for-wales---welsh.html">"Ystadegau Allweddol ar gyfer Cymru"</a>. Swyddfa Ystadegau Gwladol<span class="reference-accessdate">. Cyrchwyd <span class="nowrap">2012-12-12</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Ystadegau+Allweddol+ar+gyfer+Cymru&rft.pub=Swyddfa+Ystadegau+Gwladol&rft_id=http%3A%2F%2Fwww.ons.gov.uk%2Fons%2Frel%2Fcensus%2Fcyfrifiad-2011%2Fystadegau-allweddol-ar-gyfer-awdurdodau-unedol-yng-nghymru%2Fstb-2011-key-statistics-for-wales---welsh.html&rfr_id=info%3Asid%2Fcy.wikipedia.org%3ACyfrifiad+y+Deyrnas+Unedig+2011" class="Z3988"></span><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r8312344"></span> </li> </ol></div></div> <div style="clear: both; background-color: var(--background-color-neutral-subtle, #f8f9fa); color: inherit; border: 1px solid var(--border-color-base, #a2a9b1); padding: 5px; padding-left: 10px; text-align: left; font-size: 90%; margin-top: 1em;"><span typeof="mw:File"><a href="/wiki/Delwedd:Open_Access_logo_PLoS_transparent.svg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/77/Open_Access_logo_PLoS_transparent.svg/12px-Open_Access_logo_PLoS_transparent.svg.png" decoding="async" width="12" height="19" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/77/Open_Access_logo_PLoS_transparent.svg/18px-Open_Access_logo_PLoS_transparent.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/77/Open_Access_logo_PLoS_transparent.svg/24px-Open_Access_logo_PLoS_transparent.svg.png 2x" data-file-width="640" data-file-height="1000" /></a></span> Mae'r erthygl hon yn cynnwys testun o <a rel="nofollow" class="external text" href="http://www.comisiynyddygymraeg.org/">wefan Comisiynydd y Gymraeg</a>. 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