| Iulianus | | - | Ancient Roman | |
| Iulius | | YOO:-li-uws | Ancient Roman | |
| Iunia | | - | Ancient Roman, Biblical Latin | |
| Iunius | | - | Ancient Roman | |
| Iuvenalis | | - | Ancient Roman | |
| Iva (2) | | - | Czech, Slovak, Slovene | |
| Ivan | | ee-VAHN (Russian, Ukrainian), IE-vən (English) | Russian, Bulgarian, Ukrainian, Belarusian, Serbian, Croatian, Czech, Slovak, Macedonian, Slovene, En | |
| Ivana | | - | Czech, Slovak, Serbian, Croatian, Slovene, Bulgarian, Macedonian | |
| Ivanka | | - | Bulgarian, Czech, Slovak, Serbian, Croatian, Slovene | |
| Ivo (1) | | EE-vo (German, Dutch, Italian), EE-fo (German), EE-voo (Portuguese) | German, Dutch, Italian, Portuguese, Czech, Ancient Germanic | |
| Ivonette | | - | English (Rare) | |
| Ivor | | IE-vawr (English), EE-vawr (English) | Irish, Scottish, Welsh, English (British) | |
| Ivy | | IE-vee | English | |
| Izabelle | | IZ-ə-bel | English (Modern) | |
| Izidor | | - | Slovene | |