| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 301 | Gethin | Welsh | Dark-skinned. | M | |
| 302 | Gilbert | Welsh | Legendary son of Cadgyffro. | M | |
| 303 | Gilvaethwy | Welsh | Legendary son of Don. | M | |
| 304 | GIyn | Welsh | Dwells in the glen. | M | |
| 305 | GIynn | Welsh | Dwells in the glen. | M | |
| 306 | Gleis | Welsh | Legendary son of Merin. | M | |
| 307 | Glenn | Welsh | Dwells in the glen. | M | |
| 308 | Glew | Welsh | Legendary son of Ysgawd. | M | |
| 309 | Glinyeu | Welsh | Legendary son of Taran. | M | |
| 310 | Glyn | Welsh | Valley. | M | |
| 311 | Gobrwy | Welsh | Legendary son of Echel Pierced Thighs. | M | |
| 312 | Goreu | Welsh | Legendary son of Custenhin. | M | |
| 313 | Gormant | Welsh | Legendary son of Rica. | M | |
| 314 | Gorsedd | Welsh | From the mound. | M | |
| 315 | Govan | Welsh | Legendary son of Caw. | M | |
| 316 | Govannon | Welsh | Legendary son of Don. | M | |
| 317 | Gower | Welsh | Pure. | M | |
| 318 | Gowyr | Welsh | Pure. | M | |
| 319 | Granwen | Welsh | Legendary son of Llyr. | M | |
| 320 | Greid | Welsh | Legendary son of Eri. | M | |