| Jadran | | - | Croatian, Serbian, Slovene | |
| Jadranka | | - | Croatian, Serbian, Slovene | |
| Jadranko | | - | Croatian, Serbian, Slovene | |
| Jaga | | - | Croatian, Serbian, Macedonian | |
| Jagoda | | yah-GAW-dah (Polish) | Croatian, Serbian, Macedonian, Polish | |
| Jakov | | - | Serbian, Croatian, Macedonian | |
| Jana (2) | | YAH-nah | Croatian, Serbian | |
| Janja | | - | Croatian, Serbian | |
| Janko | | - | Slovene, Croatian, Serbian, Slovak | |
| Jasmina | | - | Croatian, Serbian, Slovene, Macedonian | |
| Jasna | | - | Croatian, Serbian, Slovene, Macedonian | |
| Javor | | - | Croatian, Serbian, Slovene | |
| Jefimija | | - | Serbian | |
| Jela | | - | Serbian, Croatian, Slovak | |
| Jelena | | - | Serbian, Croatian, Slovene, Estonian, Latvian, Lithuanian | |