| Dáire | Man | Irish Names |
| Daithí | Man | Irish Names |
| Daley | Unisex | Irish Names |
| Darra | Unisex | Irish Names |
| Darragh | Man | Irish Names |
| Darrah | Man | Irish Names |
| Darren | Unisex | Irish Names |
| Declan | Man | Irish Names |
| Deidra | Woman | Irish Names |
| Deirbhile | Woman | Irish Names |
| Deirdra | Woman | Irish Names |
| Deirdre | Woman | Irish Names |
| Delma | Woman | Irish Names |
| Dempsey | Man | Irish Names |
| Dermot | Man | Irish Names |
| Derry | Unisex | Irish Names |
| Derval | Woman | Irish Names |
| Dervla | Woman | Irish Names |
| Desmond | Man | Irish Names |
| Devan | Unisex | Irish Names |