| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 421 | Guinevere | Celtic | White lady. | F | |
| 422 | Guy | Celtic | Sensible. | M | |
| 423 | Gwalchmai | Celtic | From Arthurian legend. | M | |
| 424 | Gwawl | Celtic | Mythical son of Clud. | M | |
| 425 | Gwen | Celtic | Mythical son of Gwastad. | M | |
| 426 | Gwendolen | Celtic | Of the white brow. | F | |
| 427 | Gwendolin | Celtic | Of the white brow. | F | |
| 428 | Gweneth | Celtic | Blessed. | F | |
| 429 | Gwenith | Celtic | Blessed. | F | |
| 430 | Gwenn | Celtic | Of the white brow. | F | |
| 431 | Gwenneth | Celtic | Blessed. | F | |
| 432 | Gwenyver | Celtic | White lady. | F | |
| 433 | Gwern | Celtic | Mythical son of Matholwch. | M | |
| 434 | Gwernaeh | Celtic | Mythical. | M | |
| 435 | Gwri | Celtic | Of the golden hair. | M | |
| 436 | Gwyndolin | Celtic | Of the white brow. | F | |
| 437 | Gwynham | Celtic | Mythical father of Teithi. | M | |
| 438 | Gwynith | Celtic | Blessed. | F | |
| 439 | Gwynn | Celtic | Of the white brow. | F | |
| 440 | Harvey | Celtic | 'Eager for battle.'. | M | |