| Janko | | - | Slovene, Croatian, Serbian, Slovak | |
| Janna | | YAHN-nah (Dutch, Finnish), JAN-ə (English) | Dutch, Swedish, Finnish, English | |
| Jannah | | JAN-ə | English (Rare) | |
| Jannette | | JAN-ət, jə-NET | English | |
| Jannine | | jə-NEEN | English (Rare) | |
| Januarius | | - | Ancient Roman | |
| Jaqueline | | JAK-ə-leen (English), JAK-ə-lin (English) | English (Modern), Portuguese (Brazilian) | |
| Jaquelyn | | JAK-ə-lin | English (Rare) | |
| Jared | | JER-əd (English), JAR-əd (English) | English, Biblical | |
| Jarl | | YAHRL (Norwegian, Swedish, Danish) | Norwegian, Swedish, Danish, Norse Mythology, Ancient Scandinavian | |
| Jarod | | JER-əd, JAR-əd | English | |
| Jaron (2) | | - | English (Modern) | |
| Jarred | | JER-əd, JAR-əd | English | |
| Jarrett | | JER-ət, JAR-ət | English | |
| Jarrod | | JER-əd, JAR-əd | English | |