| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 281 | Gwernaeh | Celtic | Mythical. | M | |
| 282 | Gwri | Celtic | Of the golden hair. | M | |
| 283 | Gwynham | Celtic | Mythical father of Teithi. | M | |
| 284 | Harvey | Celtic | 'Eager for battle.'. | M | |
| 285 | Hefeydd | Celtic | Mythical father of Rhiannon. | M | |
| 286 | Heilyn | Celtic | Mythical son of Gwyn. | M | |
| 287 | Henbeddestr | Celtic | Fastest man. | M | |
| 288 | Henwas | Celtic | Mythical brother of Henbeddestr. | M | |
| 289 | Herne | Celtic | Mythical hunter god. | M | |
| 290 | Huarwar | Celtic | Mythical son of Halwn. | M | |
| 291 | Hueil | Celtic | Mythical son of Caw. | M | |
| 292 | Iden | Celtic | Wealthy. | M | |
| 293 | Inness | Celtic | From the island. | M | |
| 294 | Innis | Celtic | From the island. | M | |
| 295 | Irven | Celtic | White. | M | |
| 296 | Irvin | Celtic | White. | M | |
| 297 | Irving | Celtic | White. | M | |
| 298 | Irvyn | Celtic | White. | M | |
| 299 | Jarvis | Celtic | Variant of Gervase: Servant spear. This name is derived from combining an Old Gcrman name meaning spear, and the Celtic word for servant. Famous bearer: martyr St Gervase who died in Milan. | M | |
| 300 | Kane | Celtic | Warrior. Intelligent. Popular as a first name in Australia. | M | |