| Iustinianus | | - | Late Roman | |
| Iustinus | | - | Late Roman | |
| Iustus | | - | Late Roman | |
| Iuvenalis | | - | Ancient Roman | |
| IvÁN | | - | Spanish, Hungarian | |
| Iva (1) | | - | Bulgarian, Serbian, Croatian, Macedonian | |
| Ivailo | | - | Bulgarian | |
| Ivan | | ee-VAHN (Russian, Ukrainian), IE-vən (English) | Russian, Bulgarian, Ukrainian, Belarusian, Serbian, Croatian, Czech, Slovak, Macedonian, Slovene, En | |
| IvanČIca | | - | Croatian | |
| Ivana | | - | Czech, Slovak, Serbian, Croatian, Slovene, Bulgarian, Macedonian | |
| Ivane | | - | Georgian | |
| Ivanka | | - | Bulgarian, Czech, Slovak, Serbian, Croatian, Slovene | |
| Ivanna | | - | Russian (Rare) | |
| Ivano | | - | Italian | |
| Ivar | | EE-vahr (Swedish, Norwegian) | Swedish, Norwegian, Danish | |