| Jacinto | | hah-THEEN-to (Spanish), hah-SEEN-to (Latin American Spanish) | Spanish, Portuguese | |
| 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 | |
| Jadran | | - | Croatian, Serbian, Slovene | |
| Jadranka | | - | Croatian, Serbian, Slovene | |
| Jadranko | | - | Croatian, Serbian, Slovene | |
| Jadvyga | | - | Lithuanian | |
| Jafet | | - | Spanish | |
| Jaga | | - | Croatian, Serbian, Macedonian | |
| Jagadish | | - | Indian, Kannada, Telugu | |
| Jagannath | | - | Indian, Hindi | |
| Jagdish | | - | Indian, Hindi, Marathi, Gujarati | |