| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Fionn | FIN, FYOON | Irish, Irish Mythology | ||
| FionnÁN | - | Irish | ||
| Fionnbarra | - | Irish | ||
| Fionnbharr | FIN-var | Irish | ||
| Fionnghall | - | Scottish | ||
| Fionnghuala | - | Irish, Scottish, Irish Mythology | ||
| Fionnlagh | - | Irish, Scottish | ||
| Fionntan | - | Irish, Scottish | ||
| Fionnuala | - | Irish, Irish Mythology | ||
| Fionola | - | Irish, Scottish | ||
| Firat | - | Turkish | ||
| Firdaus | - | Arabic, Persian | ||
| Firenze | - | Various | ||
| Firoozeh | - | Persian | ||
| Firouzeh | - | Persian |