| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 601 | Fearghall | Irish | Courageous man. | M | |
| 602 | Fearghus | Irish | Variant of Fearghall: Courageous man. | M | |
| 603 | Feargus | Irish | Variant of Fearghall: Courageous man. | M | |
| 604 | Fechin | Irish | Variant of Fehin: Little raven. | M | |
| 605 | Fehin | Irish | Little raven. | M | |
| 606 | Feich | Irish | Raven. | M | |
| 607 | Feichin | Irish | Variant of Fehin: Little raven. | M | |
| 608 | Feidhlim | Irish | Good forever. | M | |
| 609 | Feidhlimidh | Irish | Variant of Feidhlim: Good forever. | M | |
| 610 | Felan | Irish | Variant of Faolan: Small wolf. | M | |
| 611 | Felim | Irish | Variant of Feidhlim: Good forever. | M | |
| 612 | Feoras | Irish | Rock. | M | |
| 613 | Fergal | Irish | Brave. | M | |
| 614 | Fergus | Irish | Variant of Fearghall: Courageous man. | M | |
| 615 | Ferrel | Irish | Variant of Farrell: Brave man. | M | |
| 616 | Ferrell | Irish | Brave. | M | |
| 617 | Ferrill | Irish | Variant of Farrell: Brave man. | M | |
| 618 | Ferryl | Irish | Variant of Farrell: Brave man. | M | |
| 619 | Fiachra | Irish | Saint. | M | |
| 620 | FIannan | Irish | Ruddy. | M | |