| Griffin | Man | Welsh Names |
| Griffith | Man | Welsh Names |
| Gruffudd | Man | Welsh Names |
| Grugwyn | Man | Welsh Names |
| Guenevere | Woman | Welsh Names |
| Guinevere | Woman | Welsh Names |
| Guto | Man | Welsh Names |
| Gwalchmai | Man | Welsh Names |
| Gwaltney | Man | Welsh Names |
| Gwawr | Woman | Welsh Names |
| Gwen | Woman | Welsh Names |
| Gwendolyn | Woman | Welsh Names |
| Gwenhwyfar | Woman | Welsh Names |
| Gwenifer | Woman | Welsh Names |
| Gwenllian | Woman | Welsh Names |
| Gwennan | Woman | Welsh Names |
| Gwenno | Woman | Welsh Names |
| Gwern | Man | Welsh Names |
| Gwil | Man | Welsh Names |
| Gwilym | Man | Welsh Names |