| Gender | Baby Name | Meaning |
|---|---|---|
 | Gareth | Gentle |
| Gavan | White hawk |
 | Gethin | Dark skinned |
| Gladys | Ruler |
| Glain | Jewel |
| Glenda | Holy and good |
| Glenys | Pure, holy |
| Glyn | Valley |
| Glynis | Pure, holy or valley |
| Glynn | Valley |
| Glynnis | Pure, holy or valley |
| Griffin | Strong chief |
| Griffith | Strong chief |
| Guenevere | White, fair and smooth, soft |
| Guinevere | White, smooth, and soft |
| Guto | Griffin lord |
| Gwalchmai | Hawk of May |
| Gwawr | Dawn |
| Gwen | Fair, blessed, holy |
| Gwendolyn | Blessed ring |
| Gwenllian | Old |
| Gwennan | Blessed |
| Gwenno | Fair |
| Gwern | Alder |
| Gwilym | Strong-willed warrior |
| Gwydion | God of magic |
| Gwylan | Seagull |
| Gwyn | Fair, white, blessed |
| Gwyneth | Fortunate and blessed |
| Haf | Summer |
