| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Iancu | - | Romanian | ||
| Iantha | - | Various | ||
| Ianuarius | - | Ancient Roman | ||
| Ianus | - | Roman Mythology | ||
| Iapetus | - | Greek Mythology (Latinized) | ||
| Iapheth | - | Biblical Greek | ||
| Iared | - | Biblical Latin, Biblical Greek | ||
| Iason | - | Greek Mythology, Ancient Greek, Greek, Biblical Greek, Biblical Latin | ||
| Ib | - | Danish | ||
| Ibai | - | Basque | ||
| Ibb | - | Medieval English | ||
| Ibolya | - | Hungarian | ||
| Ibragim | - | Chechen, Ossetian | ||
| Ibraheem | - | Arabic | ||
| Ibrahim | - | Arabic, Malay, Indonesian |