| Dilys | Woman | Welsh Names |
| Dwyn | Unisex | Welsh Names |
| Dylan | Unisex | Welsh Names |
| Ebrill | Unisex | Welsh Names |
| Eilir | Woman | Welsh Names |
| Eira | Woman | Welsh Names |
| Eirian | Unisex | Welsh Names |
| Eirlys | Woman | Welsh Names |
| Eirwen | Woman | Welsh Names |
| Eirwyn | Man | Welsh Names |
| Eleri | Woman | Welsh Names |
| Elisedd | Man | Welsh Names |
| Eluned | Woman | Welsh Names |
| Elwyn | Unisex | Welsh Names |
| Emlyn | Unisex | Welsh Names |
| Emrys | Man | Welsh Names |
| Enfys | Woman | Welsh Names |
| Enid | Woman | Welsh Names |
| Ercwlff | Man | Welsh Names |
| Euros | Man | Welsh Names |