| Jadvyga | | - | Lithuanian | |
| Janina | | yah-NEE-nah (Polish, German), YAH-nee-nah (Finnish) | Polish, Finnish, German, Swedish, Lithuanian | |
| Jaroslavas | | - | Lithuanian | |
| Jelena | | - | Serbian, Croatian, Slovene, Estonian, Latvian, Lithuanian | |
| JokŪBas | | - | Lithuanian | |
| Jolanta | | yaw-LAHN-tah (Polish) | Polish, Lithuanian | |
| Jonas (1) | | YO-nus | Lithuanian | |
| Judita | | - | Lithuanian, Czech, Slovak | |
| Julija | | YOO-lee-yah (Slovene) | Slovene, Croatian, Lithuanian | |
| Juozapas | | - | Lithuanian | |
| Juozas | | - | Lithuanian | |
| Jurgis | | - | Lithuanian | |
| Justina | | jus-TEE-nə (English) | English, Slovene, Czech, Lithuanian, Late Roman | |
| Justinas | | - | Lithuanian | |