| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Gaenor | GAY-nawr | Welsh | ||
| Gareth | GAR-əth (Welsh, English) | Welsh, English (British), Arthurian Romance | ||
| Gawain | gə-WAYN (English), GOW-ən (English) | Welsh, Arthurian Romance | ||
| Geraint | GE-rient (Welsh), ji-RAYNT (English) | Welsh, Welsh Mythology, Arthurian Romance | ||
| Gerallt | - | Welsh | ||
| Gethin | - | Welsh | ||
| Gladys | GLAD-is (English) | Welsh, English | ||
| Glaw | - | Welsh | ||
| Glenda | GLEN-də | Welsh, English | ||
| Glendower | - | Welsh | ||
| Glenice | - | Welsh | ||
| Glennis | - | Welsh | ||
| Glenys | - | Welsh | ||
| Glyn | - | Welsh | ||
| Glyndwr | - | Welsh |