| Jannick | | - | Danish | |
| Jannicke | | YAHN-nik-ke (Swedish) | Norwegian, Swedish, Danish | |
| Jannik | | - | Danish | |
| Jannike | | YAHN-ni-ke (Swedish) | Norwegian, Swedish, Danish | |
| Jannine | | jə-NEEN | English (Rare) | |
| Januarius | | - | Ancient Roman | |
| Janus | | - | Roman Mythology | |
| Japheth | | JAY-fəth (English) | Biblical | |
| Japik | | - | Frisian (Rare) | |
| Jaquan | | - | African American (Modern) | |
| Jaqueline | | JAK-ə-leen (English), JAK-ə-lin (English) | English (Modern), Portuguese (Brazilian) | |
| Jaquelyn | | JAK-ə-lin | English (Rare) | |
| Jarah | | - | Biblical | |
| Jared | | JER-əd (English), JAR-əd (English) | English, Biblical | |
| Jareth | | JER-əth (English), JAR-əth (English) | Popular Culture | |