| Gaiana | | - | Ancient Greek (Latinized) | |
| Gennadius | | - | Ancient Greek (Latinized) | |
| Georgius | | - | Ancient Greek (Latinized) | |
| Heracleitus | | - | Ancient Greek (Latinized) | |
| Heraclius | | - | Ancient Greek (Latinized) | |
| Hero (2) | | - | Ancient Greek (Latinized) | |
| Herodotus | | - | Ancient Greek (Latinized) | |
| Hieronymus | | hee-RO-nee-muws (German) | German, Dutch (Archaic), Ancient Greek (Latinized) | |
| Hippocrates | | - | Ancient Greek (Latinized) | |
| Hyacinthus | | - | Greek Mythology (Latinized), Ancient Greek (Latinized) | |
| Hyginus | | - | Ancient Greek (Latinized) | |
| Irenaeus | | - | Ancient Greek (Latinized) | |
| Ireneus | | - | Ancient Greek (Latinized) | |
| Isocrates | | - | Ancient Greek (Latinized) | |
| Leontius | | - | Ancient Greek (Latinized) | |