| Name | Meaning | Gender | Origin |
|---|
| Fahey | From The Green Field | Unisex | Irish |
| Fallon | grandchild of the ruler, in charge | Male | Irish |
| Fergus | First choice: Man of strength.
| Male | Scottish |
| Finian | fair. Finians were warrior-followers of 3rd century legendary Irish hero Finn Mac Cumhail.
| Male | Irish |
| Finlay | fair heroe, sunbeam | Male | Irish |
| Finn | Blond
| Male | Irish |
| Finnegan | fair. Finians were warrior-followers of 3rd century legendary Irish hero Finn Mac Cumhail.
| Male | Irish |
| Fitz | Son of
| Male | English |
| Fitzpatrick | Son of Patrick. Surname.
| Male | |
| Flanagan | red, ruddy | Male | Irish |
| Flynn | Son of a red-haired man. Surname.
| Male | Irish |
| Fogarty | exiled one | Male | Irish |
| Gabriel | God is my strength
| Male | Hebrew |
| Gallagher | eager aide | Male | Irish |
| Garrett | Spear, Brave | Male | English |
| Gilligan | | Male | Hebrew |
| Gilroy | Servant of the King | Unisex | |
| Giolladhe | Golden
| Male | |
| Glaleanna | Dwells in the glen
| Male | |
| Godfrey | God's peace | Male | Teutonic |
| Gorman | Blue | Unisex | Irish |
| Grady | noble, illustrious | Male | Irish |
| Guinness | Brand of stout beer from Ireland. | Unisex | |
| Hogan | Youth Surname.
| Male | Irish |
| Hoireabard | Soldier
| Male | |