| Eoghan | | O-in (Irish, Scottish), YO-in (Irish, Scottish) | Irish, Scottish, Irish Mythology | |
| Fachtna | | FAKHT-na | Irish, Irish Mythology | |
| Fearghas | | - | Irish, Scottish, Irish Mythology | |
| Fedelm | | - | Irish Mythology | |
| Fedelmid | | - | Ancient Irish, Irish Mythology | |
| Fedlimid | | - | Ancient Irish, Irish Mythology | |
| Feidelm | | - | Irish Mythology | |
| Feidlimid | | - | Ancient Irish, Irish Mythology | |
| Fergus | | FUR-gəs (English) | Irish, Scottish, Irish Mythology | |
| Fiachra | | FEE-akh-ra | Irish, Irish Mythology | |
| Finn (1) | | - | Irish Mythology, Irish | |
| Finnguala | | - | Irish, Irish Mythology | |
| Finnuala | | - | Irish, Irish Mythology | |
| Fintan | | FIN-tan (Irish) | Irish, Irish Mythology | |
| Fionn | | FIN, FYOON | Irish, Irish Mythology | |