| Gaenor | Woman | Welsh Names |
| Gaerwn | Man | Welsh Names |
| Gaiwan | Unisex | Welsh Names |
| Garan | Unisex | Welsh Names |
| Gareth | Man | Welsh Names |
| Gaynor | Woman | Welsh Names |
| Geraint | Man | Welsh Names |
| Gerallt | Man | Welsh Names |
| Gethin | Man | Welsh Names |
| Gladys | Woman | Welsh Names |
| Glain | Woman | Welsh Names |
| Glenda | Woman | Welsh Names |
| Glenys | Woman | Welsh Names |
| Glyn | Unisex | Welsh Names |
| Glynis | Woman | Welsh Names |
| Glynn | Unisex | Welsh Names |
| Glynnis | Woman | Welsh Names |
| Griffin | Man | Welsh Names |
| Griffith | Man | Welsh Names |
| Gruffudd | Man | Welsh Names |