| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| IÐUNN | - | Norse Mythology, Ancient Scandinavian | ||
| IÑAKI | - | Basque | ||
| IÚILE | - | Irish | ||
| IACCHUS | - | Greek Mythology (Latinized) | ||
| IACHIN | - | Biblical Latin, Biblical Greek | ||
| IACOBUS | - | Biblical Latin | ||
| IACOMUS | - | Late Roman | ||
| IACOPO | - | Italian | ||
| IAEL | - | Biblical Greek | ||
| IAFETH | - | Biblical Latin | ||
| IAGAN | - | Scottish | ||
| IAGO | ee-A-gaw (Welsh, Galician), ee-AH-go (English) | Welsh, Galician, Portuguese | ||
| IAH | - | Egyptian Mythology | ||
| IAHEL | - | Biblical Latin | ||
| IAHMESU | - | Ancient Egyptian |