| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Itxaro | - | Basque | ||
| Itxaso | - | Basque | ||
| Itzal | - | Basque | ||
| Itzel | - | Native American, Mayan | ||
| Itziar | - | Basque, Spanish | ||
| Iucunda | - | Late Roman | ||
| Iudas | - | Biblical Latin | ||
| Iudicael | - | Ancient Celtic | ||
| Iudith | - | Biblical Latin | ||
| Iudocus | - | Ancient Celtic (Latinized) | ||
| Iulia | YOO:-li-a (Ancient Roman) | Romanian, Ancient Roman | ||
| Iulian | - | Romanian | ||
| Iuliana | - | Romanian, Ancient Roman | ||
| Iulianus | - | Ancient Roman | ||
| Iuliu | - | Romanian |