| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| I&Eth;Unn | - | Norse Mythology, Ancient Scandinavian | ||
| IÑAki | - | Basque | ||
| IÚIle | - | Irish | ||
| Iagan | - | Scottish | ||
| Iago | ee-A-gaw (Welsh, Galician), ee-AH-go (English) | Welsh, Galician, Portuguese | ||
| Iain | - | Scottish | ||
| Iakovu | - | Old Church Slavic | ||
| Ian | EE-ən (English) | Scottish, English | ||
| Iantha | - | Various | ||
| Ianto | - | Welsh | ||
| Iarfhlaith | EER-lah | Irish | ||
| Iarlaith | EER-lah | Irish | ||
| Ib | - | Danish | ||
| Ibai | - | Basque | ||
| Ibb | - | Medieval English |