| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| IANUS | - | Roman Mythology | ||
| IAPETOS | - | Greek Mythology | ||
| IAPETUS | - | Greek Mythology (Latinized) | ||
| IAPHETH | - | Biblical Greek | ||
| IARED | - | Biblical Latin, Biblical Greek | ||
| IARFHLAITH | EER-lah | Irish | ||
| IARLAITH | EER-lah | Irish | ||
| IASON | - | Greek Mythology, Ancient Greek, Greek, Biblical Greek, Biblical Latin | ||
| IB | - | Danish | ||
| IBAI | - | Basque | ||
| IBB | - | Medieval English | ||
| IBBIE | IB-ee | English | ||
| IBOLYA | - | Hungarian | ||
| IBRAGIM | - | Chechen, Ossetian | ||
| IBRAHEEM | - | Arabic |