| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| I&Eth;Unn | - | Norse Mythology, Ancient Scandinavian | ||
| Iacomus | - | Late Roman | ||
| Iacopo | - | Italian | ||
| Iago | ee-A-gaw (Welsh, Galician), ee-AH-go (English) | Welsh, Galician, Portuguese | ||
| Iah | - | Egyptian Mythology | ||
| Iahmesu | - | Ancient Egyptian | ||
| Iakob | - | Georgian | ||
| Iakopa | - | Hawaiian | ||
| Iancu | - | Romanian | ||
| Ianuarius | - | Ancient Roman | ||
| Ianus | - | Roman Mythology | ||
| Iason | - | Greek Mythology, Ancient Greek, Greek, Biblical Greek, Biblical Latin | ||
| Ib | - | Danish | ||
| Ibolya | - | Hungarian | ||
| Ibragim | - | Chechen, Ossetian |