| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Feidelm | - | Irish Mythology | ||
| Feidhelm | - | Irish | ||
| Feidhlim | FE-lim | Irish | ||
| Feidhlimidh | - | Irish | ||
| Feidlimid | - | Ancient Irish, Irish Mythology | ||
| Felim | - | Irish | ||
| Fergal | - | Irish | ||
| Fergus | FUR-gəs (English) | Irish, Scottish, Irish Mythology | ||
| Fiachna | - | Irish | ||
| Fiachra | FEE-akh-ra | Irish, Irish Mythology | ||
| Fidelma | fi-DEL-ma | Irish | ||
| Fillin | - | Irish | ||
| Finbar | FIN-bar | Irish | ||
| Finbarr | FIN-bar | Irish | ||
| Finlay | - | Irish, Scottish, English |