| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| 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 | ||
| IUSTINIANUS | - | Late Roman | ||
| IUSTINUS | - | Late Roman | ||
| IUSTUS | - | Late Roman | ||
| IUVENALIS | - | Ancient Roman | ||
| IVÁN | - | Spanish, Hungarian | ||
| IVA (1) | - | Bulgarian, Serbian, Croatian, Macedonian | ||
| IVA (2) | - | Czech, Slovak, Slovene |