| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Ieremias | - | Biblical Greek | ||
| Iesous | - | Biblical Greek | ||
| Iezekiel | - | Biblical Greek | ||
| Ikaros | - | Greek Mythology | ||
| Iliana | - | Greek, Bulgarian | ||
| Ilias | - | Greek | ||
| Ilithyia | - | Greek Mythology (Latinized) | ||
| Io | IE-o (English), EE-o (English) | Greek Mythology | ||
| Ioab | - | Biblical Latin, Biblical Greek | ||
| Ioanna | - | Greek, Biblical Greek | ||
| Ioannes | - | Biblical Greek | ||
| Ioannis | - | Greek | ||
| Iob | - | Biblical Latin, Biblical Greek | ||
| Ioel | - | Biblical Greek | ||
| Iokaste | - | Greek Mythology |