| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 361 | Gwynfor | Welsh | Fair lord or fair place. | M | |
| 362 | Gwyngad | Welsh | Legendary son of Caw. | M | |
| 363 | Gwynn | Welsh | Handsome. Son of Nudd. | M | |
| 364 | Gwyr | Welsh | Pure or from Gower. | M | |
| 365 | Gwystyl | Welsh | Legendary son of Nwython. | M | |
| 366 | Gwythyr | Welsh | Legendary son of Greidyawl. | M | |
| 367 | Hayden | Welsh | Variant of Haydn: Fire. Derived from the Celtic name Aidan. | M | |
| 368 | Haydn | Welsh | Fire. Derived from the Celtic name Aidan. | M | |
| 369 | Haydon | Welsh | Variant of Haydn: Fire. Derived from the Celtic name Aidan. | M | |
| 370 | Heilyn | Welsh | Legendary son of Gwynn. | M | |
| 371 | Hen Beddestyr | Welsh | Legendary son of Erim. | M | |
| 372 | Hen Was | Welsh | Old servant. | M | |
| 373 | Hen Wyneb | Welsh | Old face. | M | |
| 374 | Howel | Welsh | Variant of Hywel: Eminent. Attentive. | M | |
| 375 | Howell | Welsh | Variant of Hywel: Eminent. Attentive. | M | |
| 376 | Hu | Welsh | Welsh form of Hugh 'intelligent'. | M | |
| 377 | Huabwy | Welsh | Legendary son of Gwryon. | M | |
| 378 | Huarwar | Welsh | Legendary son of Avlawn. | M | |
| 379 | Hueil | Welsh | Legendary son of Caw. | M | |
| 380 | Huey | Welsh | Variant of the Latin Hugh. A thinker. Intelligent. | M | |