| Jancsi | | YAWN-chee | Hungarian | |
| Jani | | YAH-nee (Finnish) | Finnish, Hungarian | |
| Janika | | - | Hungarian | |
| Janina | | yah-NEE-nah (Polish, German), YAH-nee-nah (Finnish) | Polish, Finnish, German, Swedish, Lithuanian | |
| Janine | | zha-NEEN (French), jə-NEEN (English) | French, English, Dutch, German | |
| Janja | | - | Croatian, Serbian | |
| Janko | | - | Slovene, Croatian, Serbian, Slovak | |
| Janne (2) | | - | Danish, Norwegian | |
| Jannick | | - | Danish | |
| Jannicke | | YAHN-nik-ke (Swedish) | Norwegian, Swedish, Danish | |
| Jannik | | - | Danish | |
| Jannike | | YAHN-ni-ke (Swedish) | Norwegian, Swedish, Danish | |
| Januarius | | - | Ancient Roman | |
| Janus | | - | Roman Mythology | |
| Japik | | - | Frisian (Rare) | |