| Fynbar | Blond | Male |
| Gall | Stranger | Male |
| Galvyn | Sparrow | Male |
| Gilda | Golden. Also An Abbreviation Of Teutonic Names Containing Gilde. | Female |
| Gilroy | Serves The Redhead | Male |
| Glenn | From The Valley | Male |
| Glifieu | Myth Name (Son Of Taran) | Male |
| Glyn | From The Valley | Male |
| Gorsedd | Myth Name (From Arberth) | Male |
| Gruddieu | Myth Name (Son Of Muriuel) | Male |
| Guinevere | White Lady | Female |
| Gwalchmai | Myth Name, Arthurian Legend (Gawain) | Male |
| Gwen | Mythical Son Of Gwastad | Male |
| Gweneth | Blessed | Female |
| Gwenith | Blessed | Female |
| Gwenn | Of The White Brow | Female |
| Gwern | Mythical Son Of Matholwch | Male |
| Gwernaeh | Mythical | Male |
| Gwri | Of The Golden Hair | Male |
| Gwyndolin | Of The White Brow | Female |
| Gwynham | Mythical Father Of Teithi | Male |
| Gwynith | Blessed | Female |
| Hefeydd | Mythical Father Of Rhiannon | Male |
| Henwas | Mythical Brother Of Henbeddestr | Male |
| Herne | Myth Name (A Hunter God) | Male |