| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Ionela | yo-NEL-ah | Romanian | ||
| IonuȚ | - | Romanian | ||
| Iordan | - | Bulgarian | ||
| Ioseb | - | Georgian | ||
| Iosephus | - | Late Roman | ||
| Iosif | ee-O-seef (Russian), YO-seef (Romanian) | Russian, Romanian, Greek | ||
| Iovianus | - | Ancient Roman | ||
| Iovis | - | Roman Mythology | ||
| Iovita | - | Ancient Roman | ||
| Ipati | - | Russian (Rare) | ||
| Ipatiy | - | Russian (Rare) | ||
| Ippolit | - | Russian | ||
| Ippolito | - | Italian | ||
| IrÉN | - | Hungarian | ||
| Ira (2) | - | Russian |