| Creirwy | Welsh | Derived from the Welsh creir (a tok.. |  |  |
| Cwrig | Welsh | Welsh form of the Greek Kyriakos, a.. | | |
| Cynan | Welsh | Popular name derived from the Old C.. | | |
| Cynddelw | Welsh | An old name of uncertain derivation.. | | |
| Cyndeyrn | Welsh | Welsh form of the Scottish Kantiger.. |  | |
| Cyril | Welsh | A borrowing from the English, Cyril.. |  | |
| Cystenian | Welsh | Welsh form of Constantine, a name d.. | | |
| Dafydd | Welsh | Welsh form of David (beloved). See .. | | |
| Dai | Welsh | Derived from the Celtic dei (to shi.. | | |
| Daniel | Welsh | Derived from the Hebrew dani'el (Go.. | | |
| David | Welsh | Derived from the Hebrew david (belo.. | | |
| Davis | Welsh | A name that means "son of David."
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| Deiniol | Welsh | Welsh form of Daniel (God is my jud.. | | |
| Delwyn | Welsh | Compound name composed of the Welsh.. | | |
| Delyth | Welsh | Derived from the Welsh element del .. | | |
| Deryn | Welsh | Meaning "bird." | | |
| Dewi | Welsh | Welsh form of David (beloved), that.. | | |
| Diana | Welsh | A borrowing from the English, Diana.. | | |
| Dilwen | Welsh | Compound name composed of the eleme.. | | |
| Dilwyn | Welsh | Compound name composed of the Welsh.. | | |
| Dilys | Welsh | Directly derived from the Welsh dil.. | | |
| Drystan | Welsh | Variant form of Tristan (sad). See .. | | |
| Dwynwen | Welsh | Compound name composed from the Wel.. | | |
| Dylan | Welsh | Of uncertain derivation, some belie.. | | |
| Dynawd | Welsh | Welsh form of the Latin Donatus (gi.. | | |
| Eibhlin | Welsh | A borrowing from the Irish, Eibhlin.. | | |
| Eiddwen | Welsh | Compound name composed of the eleme.. | | |
| Eileen | Welsh | English variant of the French Aveli.. | | |
| Einlon | Welsh | Derived from the Welsh einion (anvi.. | | |
| Eira | Welsh | Derived directly from the Welsh eir.. | | |
| Eirwen | Welsh | Modern coinage formed by combining .. | | |
| Elen | Welsh | Derived from elin (nymph). Alternat.. | | |
| Eleri | Welsh | Of unknown etymology, the name Eler.. | | |
| Elisa | Welsh | Short form of Elizabeth (God is my .. | | |
| Elizabeth | Welsh | Derived from the Hebrew elisheba' (.. | | |
