| Name | Group | Language of Origin | Languages of Use | Meaning/Translation or Related Words | US 2021 |
| Angharad | Angharad | Welsh | Welsh | | |
| Bethan | Elizabeth | Hebrew | Welsh | My God is abundance; My God has sworn | |
| Branwen | Branwen | Welsh | English, Welsh | Words: white, fair, shining | |
| Bronwen | Bronwen | Welsh | English, Welsh | Words: white, fair, shining | |
| Brynn | Brynn | Welsh | English, Welsh | hill | #362 |
| Cari | Cari | Welsh | English, Welsh | love | |
| Carys | Cerys | Welsh | Welsh | love | |
| Cerys | Cerys | Welsh | English, Welsh | love | |
| Deri | Deri | Welsh | Welsh | oaks | |
| Dylan | Dylan/Dylan | Welsh | German, English, Welsh | sea | #44 |
| Ellis | Ellis | Welsh | English, Welsh | the kind | |
| Enid | Enid | Welsh | Welsh | soul | |
| Gareth | Gareth | Welsh | English, Welsh | | |
| Gavin | Gavin | Welsh | English, Scottish, Welsh | white hawk | #173 |
| Glenda | Glenda | Welsh | German, Welsh | Words: clean, pure, holy / good | |
| Glenys | Glenys | Welsh | Welsh | Words: clean, pure, holy | |
| Glynis | Glenys | Welsh | Welsh | Words: clean, pure, holy | |
| Gwendolen | Gwendolin | Welsh | English, Welsh | white ring | |
| Gwendolin | Gwendolin | Welsh | German, English, Welsh | white ring | |
| Gwendoline | Gwendolin | Welsh | German, English, Welsh | white ring | |
| Gwendolyn | Gwendolin | Welsh | English, Welsh | white ring | #398 |
| Gwenfrewi | Winifred | Celtic | Welsh | Words: white, fair, shining | |
| Gwladys | Claudius/Claudia | Latin | Welsh | the limping | |
| Gwyneth | Gwyneth | Welsh | English, Welsh | maybe happiness | |
| Kendal | Kendall/Kendall | Old English | English, Welsh | valley of the River Kent | |
| Kendall | Kendall/Kendall | Old English | English, Welsh | valley of the River Kent | |
| Madoc | Madoc | Welsh | Welsh | maybe fortunate | |
| Maredudd | Maredudd | Welsh | Welsh | maybe lord of the sea | |
| Mari | Mary | Hebrew | Scandinavian, Hungarian, Breton, Finnish, Welsh | maybe bitterness | |
| Martyn | Martin/Martina | Latin | Welsh | Words: Mars | |
| Megan | Margarete | Old Greek | English, Welsh | the pearl | #611 |
| Micah | Micah/Micah | Hebrew | German, English, Welsh | Who is like Yahweh? | #107 |
| Morgan | Morgan/Morgana | Celtic | English, Welsh | Words: sea | #612 |
| Morgan | Morgan/Morgana | Celtic | English, Welsh | Words: sea | #205 |
| Nesta | Agnes | Old Greek | Welsh | the pure, the chaste | |
| Owen | Owen | Welsh | English, Welsh | | #22 |
| Padrig | Patrick/Patrizia | Latin | Welsh | nobleman | |
| Reece | Reece/Reese/Reece | Welsh | English, Welsh | ardor | #579 |
| Rhian | Rhian | Welsh | Welsh | the maiden | |
| Rhiannon | Rhiannon | Celtic | Welsh | great queen | |
| Rhydian | Rhydian | Unknown | Welsh | Words: ford | |
| Rhys | Reece/Reese/Reece | Welsh | Welsh | ardor | #413 |
| Sian | John/Johanna | Hebrew | Welsh | Yahweh is gracious | |
| Siana | John/Johanna | Hebrew | Welsh | Yahweh is gracious | |
| Tegan | Tegan/Tegan | Welsh | English, Welsh | fair | |
| Trevor | Trevor | Welsh | English, Welsh | big village | #459 |
| Uther | Uther | Welsh | English, Welsh | maybe terrible | |
| Vaughan | Vaughan | Welsh | English, Welsh | small | |
| Winifred | Winifred | Celtic | German, English, Welsh | Words: white, fair, shining | |
| Winnifred | Winifred | Celtic | German, English, Welsh | Words: white, fair, shining | |