| Gender | Baby Name | Meaning |
|---|---|---|
 | Hedd | Peace |
 | Heulwen | Sunshine |
| Howell | Seeing clearly |
| Hywel | Eminent, conspicuous |
| Ianto | Gift of God |
| Ieuan | Gift of God |
| Ifan | Gift of God |
| Ioan | Gift of God |
| Iolo | Worthy lord |
| Iorwen | Fair, blessed lady |
| Iorwerth | Worthy lord |
| Isolde | Fair lady |
| Jones | Son of John |
| Mabon | Divine son |
| Maddock | Good |
| Megan | Pearl |
| Meghan | Pearl |
| Mervin | Great lord |
| Nesta | Pure |
| Powell | Son of Howell |
| Reece | Enthusiastic, eager |
| Siriol | Cheerful |
| Tudor | People king |
| Wynn | Fair, white, blessed |
| Yestin | Just |
| Meredith | Guardian of sea |
