| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Icarus | IK-ə-rəs (English) | Greek Mythology (Latinized) | ||
| Iedida | - | Biblical Greek | ||
| Iephthae | - | Biblical Greek | ||
| 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 |