| Jackin | | - | Medieval English | |
| Jacob | | JAY-kəb (English), YAH-kawp (Dutch) | English, Dutch, Swedish, Norwegian, Danish, Jewish, Biblical | |
| Jacobine | | yah-ko-BEE-nə (Dutch) | Norwegian, Danish, Dutch | |
| Jacobo | | hah-KO-bo | Spanish | |
| Jacobus | | yah-KO-bus (Dutch) | Dutch, Late Roman | |
| Jacopo | | YAH-ko-po | Italian | |
| Jacquette | | - | French (Rare) | |
| Jada (2) | | - | Biblical | |
| Jadon | | JAH-dən (English), JAY-dən (English) | Biblical | |
| Jadran | | - | Croatian, Serbian, Slovene | |
| Jadranka | | - | Croatian, Serbian, Slovene | |
| Jadranko | | - | Croatian, Serbian, Slovene | |
| Jadvyga | | - | Lithuanian | |
| Jae | | JAY | English (Rare) | |
| Jael | | JAY-əl (English), JAYL (English) | Biblical | |