| I&Eth;Unn | | - | Norse Mythology, Ancient Scandinavian | |
| Iacchus | | - | Greek Mythology (Latinized) | |
| Iah | | - | Egyptian Mythology | |
| Ianthe | | - | Greek Mythology | |
| Ianus | | - | Roman Mythology | |
| Iapetos | | - | Greek Mythology | |
| Iapetus | | - | Greek Mythology (Latinized) | |
| Iason | | - | Greek Mythology, Ancient Greek, Greek, Biblical Greek, Biblical Latin | |
| Icarus | | IK-ə-rəs (English) | Greek Mythology (Latinized) | |
| Idun | | - | Norse Mythology | |
| Ikaros | | - | Greek Mythology | |
| Ilithyia | | - | Greek Mythology (Latinized) | |
| Ilmarinen | | - | Finnish Mythology | |
| Ilmatar | | - | Finnish Mythology | |
| Inanna | | i-NAH-na | Near Eastern Mythology | |