| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 461 | Gruffin | Welsh | Fierce lord. | M | |
| 462 | Gruffudd | Welsh | Red haired. | M | |
| 463 | Gruffyn | Welsh | Fierce lord. | M | |
| 464 | Grufydd | Welsh | Red haired. | M | |
| 465 | Gryphin | Welsh | Strong in faith. | M | |
| 466 | Gryphon | Welsh | Fighting chief; fierce. The fierce Gryphon of Greek mythology and medieval legend was a creature with foreparts of an eagle and hindquarters of a lion. | M | |
| 467 | Guenevere | Welsh | Fair one. Guinevere was King Arthur's mythological queen. Jennifer derives from this name. | F | |
| 468 | Guinevere | Welsh | From the name Gwenhwyfar, meaning fair and yielding. | F | |
| 469 | Gusg | Welsh | Legendary son of Achen. | M | |
| 470 | Gwaeddan | Welsh | Legendary daughter of Kynvelyn. | F | |
| 471 | Gwakhmai | Welsh | Hawk of the battle. | M | |
| 472 | Gwalchmei | Welsh | Legendary son of Gwyar. | M | |
| 473 | Gwalhaved | Welsh | Legendary son of Gwyar. | M | |
| 474 | Gwallawg | Welsh | Legendary son of Llenawg. | M | |
| 475 | Gwallter | Welsh | Welsh form of Walter 'strong fighter'. | M | |
| 476 | Gwanwyn | Welsh | Spring. | F | |
| 477 | Gwarthegydd | Welsh | Legendary son of Caw. | M | |
| 478 | Gwawl | Welsh | Legendary son of Clud. | M | |
| 479 | Gwayne | Welsh | White hawk. Variant of the medieval name Gawain. | M | |
| 480 | Gweir | Welsh | Legendary son of Cadellin Silver. | M | |