| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Devnet | DEV-net | Irish | ||
| Diarmaid | DEER-mid | Irish, Irish Mythology | ||
| Diarmait | - | Irish, Irish Mythology | ||
| Diarmuid | - | Irish, Irish Mythology | ||
| Doireann | - | Irish, Irish Mythology | ||
| Doirend | - | Irish Mythology | ||
| Domhnall | DO-nahl | Scottish, Irish | ||
| Domnall | - | Scottish, Irish | ||
| Donagh | - | Irish | ||
| Donal | DO-nal | Irish | ||
| Donnchad | - | Scottish, Irish | ||
| Donnchadh | - | Scottish, Irish | ||
| DonndubhÁN | - | Ancient Irish | ||
| Donovan | - | Irish, English | ||
| Doran | - | Irish |