| Name | Meaning | Gender | Origin |
|---|
| Fagan | Joyful
| Male | |
| Fallon | grandchild of the ruler, in charge | Male | Irish |
| Felix | Lucky
| Male | Latin |
| Fergus | First choice: Man of strength.
| Male | Scottish |
| Ferris | Rock
| Male | Irish |
| Finian | fair. Finians were warrior-followers of 3rd century legendary Irish hero Finn Mac Cumhail.
| Male | Irish |
| Finn | Blond
| Male | Irish |
| Finnegan | fair. Finians were warrior-followers of 3rd century legendary Irish hero Finn Mac Cumhail.
| Male | Irish |
| Floyd | after Pink Floyd | Male | Welsh |
| Flynn | Son of a red-haired man. Surname.
| Male | Irish |
| Forbes | Headstrong
| Male | Scottish |
| Frederick | peaceful ruler | Male | |
| Gallagher | eager aide | Male | Irish |
| Galloway | stranger | Male | Scottish |
| Garrett | Spear, Brave | Male | English |
| Gavin | White hawk
| Male | Celtic |
| Gillespie | bishop's servant | Male | Scottish |
| Gilmore | Servant Of Mary | Male | Celtic |
| Gilroy | Servant of the King | Unisex | |
| Glen | From The Glen | Male | Welsh |
| Gordon | from the cornered hill | Male | Scottish |
| Gorman | Blue | Unisex | Irish |
| Grady | noble, illustrious | Male | Irish |
| Guy | guide; wood or wide | Male | |
| Harvey | as in The Pooka | Male | |