| Janko | | - | Slovene, Croatian, Serbian, Slovak | |
| Janna | | YAHN-nah (Dutch, Finnish), JAN-ə (English) | Dutch, Swedish, Finnish, English | |
| Jannah | | JAN-ə | English (Rare) | |
| Janne (1) | | YAHN-ne | Finnish, Swedish | |
| Janne (2) | | - | Danish, Norwegian | |
| Jannette | | JAN-ət, jə-NET | English | |
| 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) | |
| Janusz | | YAH-nuwsh | Polish | |
| Japik | | - | Frisian (Rare) | |
| Jaqueline | | JAK-ə-leen (English), JAK-ə-lin (English) | English (Modern), Portuguese (Brazilian) | |
| Jaquelyn | | JAK-ə-lin | English (Rare) | |