| Jam | | - | Persian Mythology | |
| Jamshed | | - | Persian, Tajik, Persian Mythology | |
| Jamsheed | | - | Persian, Persian Mythology | |
| Jamshid | | - | Persian, Persian Mythology | |
| Janus | | - | Roman Mythology | |
| Jarl | | YAHRL (Norwegian, Swedish, Danish) | Norwegian, Swedish, Danish, Norse Mythology, Ancient Scandinavian | |
| Jason | | JAY-sən (English) | English, French, Greek Mythology (Anglicized), Biblical | |
| Jimmu | | jeem-moo (Japanese) | Far Eastern Mythology | |
| Jocasta | | jo-KAS-tə (English) | Greek Mythology (Latinized) | |
| Joukahainen | | - | Finnish Mythology | |
| Jove | | JOV (English) | Roman Mythology (Anglicized) | |
| Juno | | JOO-no (English) | Roman Mythology | |
| Jupiter | | JOO-pi-tər (English) | Roman Mythology (Anglicized) | |
| Juturna | | - | Roman Mythology | |
| Juventas | | - | Roman Mythology | |