| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 501 | Gwevyl | Welsh | Legendary son of Gwastad. | M | |
| 502 | Gwilenhin | Welsh | Legendary king of France. | M | |
| 503 | Gwilym | Welsh | A Welsh variant of William, meaning resolute protector. | M | |
| 504 | Gwitart | Welsh | Legendary son of Aedd. | M | |
| 505 | Gwladys | Welsh | A variant of Claudia, meaning lame. | F | |
| 506 | Gwrddywal | Welsh | Legendary son of Evrei. | M | |
| 507 | Gwres | Welsh | Legendary son of Rheged. | M | |
| 508 | Gwyddawg | Welsh | Legendary son of Menestyr. | M | |
| 509 | Gwydre | Welsh | Legendary son of Arthur. | M | |
| 510 | Gwydyon | Welsh | Legendary son of Don. | M | |
| 511 | Gwylim | Welsh | A Welsh variant of William, meaning resolute protector. | M | |
| 512 | Gwyn | Welsh | Diminutive of Gwyneth: White. Fair. Happiness. Blessed. | F | |
| 513 | Gwyn | Welsh | White or handsome. | M | |
| 514 | Gwyndolen | Welsh | White browed. | F | |
| 515 | Gwyndolyn | Welsh | Fair; blessed. | F | |
| 516 | Gwynedd | Welsh | White, happiness, blessed. Also a North Wales county name. | F | |
| 517 | Gwyneth | Welsh | White. Fair. Happiness. Blessed. | F | |
| 518 | Gwynfor | Welsh | Fair lord or fair place. | M | |
| 519 | Gwyngad | Welsh | Legendary son of Caw. | M | |
| 520 | Gwynn | Welsh | Fair; blessed. | F | |