| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Ing | - | Germanic Mythology | ||
| 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 | ||
| Iovis | - | Roman Mythology | ||
| 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 | ||
| Iset | - | Egyptian Mythology | ||
| Ishtar | ISH-tahr (English) | Near Eastern Mythology | ||
| Isis | IE-sis (English) | Egyptian Mythology (Hellenized) | ||
| Ismene | - | Greek Mythology | ||
| Italus | - | Roman Mythology |