| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 1001 | Flyn | Irish | Son of a red-haired man. | M | |
| 1002 | Flynn | Irish | Son of a red-haired man. Surname. | M | |
| 1003 | Fogartaigh | Irish | Exiled. | M | |
| 1004 | Fogarty | Irish | Exiled. | M | |
| 1005 | Fogerty | Irish | Exiled. | M | |
| 1006 | Foley | Irish | Plunders. | M | |
| 1007 | Forba | Irish | Owns the fields. | M | |
| 1008 | Forgael | Irish | Variant of Fergal: Brave. | M | |
| 1009 | Fynballa | Irish | Fair shoulders. | F | |
| 1010 | Ga!l | Irish | Rooster. | M | |
| 1011 | Gadhra | Irish | Mastiff. | M | |
| 1012 | Gael | Irish | Stranger. | M | |
| 1013 | Gaffney | Irish | Calf. | M | |
| 1014 | Gaile | Irish | Stranger. | M | |
| 1015 | Gairbith | Irish | Rough peace. | M | |
| 1016 | Gale | Irish | Stranger. | M | |
| 1017 | Gallagher | Irish | Surname. | M | |
| 1018 | Galvin | Irish | Sparrow. | M | |
| 1019 | Gannon | Irish | Fair. | M | |
| 1020 | Gara | Irish | Mastiff. | M | |