| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| 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 | ||
| Ing | - | Germanic Mythology | ||
| Io | IE-o (English), EE-o (English) | Greek Mythology | ||
| Iokaste | - | Greek Mythology |