| Ignatiy | | - | Russian | |
| Igor | | EE-gər (Russian), EE-gawr (Polish) | Russian, Polish, Slovene, Croatian, Serbian, Macedonian | |
| Ilari | | EE-lah-ree (Finnish) | Russian, Finnish | |
| Ilia | | eel-YAH (Russian) | Georgian, Russian, Bulgarian, Old Church Slavic | |
| Illarion | | - | Russian | |
| Ilya | | eel-YAH | Russian | |
| Inga | | ING-ah (Swedish), ING-gah (German), EEN-gah (Russian) | Swedish, Danish, Norwegian, Icelandic, Latvian, Lithuanian, German, Russian, Ancient Scandinavian, A | |
| Inna | | EE-nah (Russian) | Russian, Ukrainian | |
| Innokenti | | - | Russian | |
| Innokentiy | | - | Russian | |
| Innokenty | | - | Russian | |
| Ioann | | - | Russian | |
| Iona (2) | | - | Russian, Georgian, Biblical Latin | |
| Iosif | | ee-O-seef (Russian), YO-seef (Romanian) | Russian, Romanian, Greek | |
| Ipati | | - | Russian (Rare) | |