| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| I&Eth;Unn | - | Norse Mythology, Ancient Scandinavian | ||
| Iachin | - | Biblical Latin, Biblical Greek | ||
| Iacobus | - | Biblical Latin | ||
| Iael | - | Biblical Greek | ||
| Iafeth | - | Biblical Latin | ||
| 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 |