| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Haul | - | Welsh | ||
| Heddwyn | - | Welsh | ||
| Hefin | - | Welsh | ||
| Hefina | - | Welsh | ||
| Heilyn | - | Welsh | ||
| Heledd | HEL-edh | Welsh | ||
| Heulwen | HIEL-wen | Welsh | ||
| Hopcyn | - | Welsh | ||
| Howell | - | Welsh | ||
| Huw | - | Welsh | ||
| Hyledd | - | Welsh | ||
| Hywel | - | Welsh | ||
| Iago | ee-A-gaw (Welsh, Galician), ee-AH-go (English) | Welsh, Galician, Portuguese | ||
| Ianto | - | Welsh | ||
| Idris (2) | - | Welsh |