| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Iucunda | - | Late Roman | ||
| Iudicael | - | Ancient Celtic | ||
| Iudocus | - | Ancient Celtic (Latinized) | ||
| Iulia | YOO:-li-a (Ancient Roman) | Romanian, Ancient Roman | ||
| Iulian | - | Romanian | ||
| Iuliana | - | Romanian, Ancient Roman | ||
| Iulianus | - | Ancient Roman | ||
| Iuliu | - | Romanian | ||
| Iulius | YOO:-li-uws | Ancient Roman | ||
| Iunia | - | Ancient Roman, Biblical Latin | ||
| Iunius | - | Ancient Roman | ||
| Iuno | - | Roman Mythology | ||
| Iuppiter | - | Roman Mythology | ||
| Iuri | - | Georgian | ||
| Iustina | - | Late Roman |