| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Iagan | - | Scottish | ||
| Iago | ee-A-gaw (Welsh, Galician), ee-AH-go (English) | Welsh, Galician, Portuguese | ||
| Iahel | - | Biblical Latin | ||
| Iahmesu | - | Ancient Egyptian | ||
| Iain | - | Scottish | ||
| Iair | - | Biblical Latin, Biblical Greek | ||
| Iairos | - | Biblical Greek | ||
| Iairus | - | Biblical Latin | ||
| Iakobos | - | Biblical Greek | ||
| Iakovu | - | Old Church Slavic | ||
| Ian | EE-ən (English) | Scottish, English | ||
| Ianuarius | - | Ancient Roman | ||
| Iapheth | - | Biblical Greek | ||
| Iared | - | Biblical Latin, Biblical Greek | ||
| Iason | - | Greek Mythology, Ancient Greek, Greek, Biblical Greek, Biblical Latin |