| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Galchobhar | - | Ancient Irish | ||
| Gallagher | GAL-ə-gər | Irish, English (Rare) | ||
| Gallchobhar | - | Irish (Rare) | ||
| GarbhÁN | GAHR-vawn | Irish | ||
| Garvan | GAHR-van | Irish | ||
| GearÓId | - | Irish | ||
| Gearalt | - | Irish | ||
| Gilroy | - | Irish, Scottish | ||
| GobÁN | - | Irish | ||
| Gobinet | - | Irish | ||
| Gobnait | GAWB-net | Irish | ||
| Gobnet | - | Irish | ||
| Gofraidh | - | Irish | ||
| Goibniu | - | Irish Mythology | ||
| Gormflaith | - | Irish |