| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| IAKOB | - | Georgian | ||
| IAKOBOS | - | Biblical Greek | ||
| IAKOPA | - | Hawaiian | ||
| IAKOVU | - | Old Church Slavic | ||
| Ian | [iən] | |||
| IAN | EE-ən (English) | Scottish, English | ||
| IANCU | - | Romanian | ||
| IANTO | - | Welsh | ||
| IANUARIUS | - | Ancient Roman | ||
| IANUS | - | Roman Mythology | ||
| IAPETOS | - | Greek Mythology | ||
| IAPETUS | - | Greek Mythology (Latinized) | ||
| IAPHETH | - | Biblical Greek | ||
| IARED | - | Biblical Latin, Biblical Greek | ||
| IARFHLAITH | EER-lah | Irish |