| Iapetus | | - | Greek Mythology (Latinized) | |
| Iason | | - | Greek Mythology, Ancient Greek, Greek, Biblical Greek, Biblical Latin | |
| Icarus | | IK-ə-rəs (English) | Greek Mythology (Latinized) | |
| Ikaros | | - | Greek Mythology | |
| Ilithyia | | - | Greek Mythology (Latinized) | |
| Io | | IE-o (English), EE-o (English) | Greek Mythology | |
| Iokaste | | - | Greek Mythology | |
| Iole | | - | Greek Mythology | |
| Ion (2) | | - | Greek Mythology | |
| Ione | | ie-O-nee (English), IE-o-nee (English), ie-ON (English) | Greek Mythology, English | |
| Iphigeneia | | - | Greek Mythology | |
| Iphigenia | | - | Greek Mythology (Latinized) | |
| Iris | | IE-ris (English), EE-ris (German, Dutch), EE-rees (Finnish, Spanish) | Greek Mythology, English, German, Dutch, Swedish, Norwegian, Danish, Finnish, French, Spanish | |
| Ismene | | - | Greek Mythology | |
| Jason | | JAY-sən (English) | English, French, Greek Mythology (Anglicized), Biblical | |