| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Jelena | - | Serbian, Croatian, Slovene, Estonian, Latvian, Lithuanian | ||
| Jelica | - | Serbian, Croatian | ||
| Jelka | - | Slovene, Croatian, Serbian | ||
| Jerko | YER-ko | Croatian | ||
| Jeronim | - | Croatian | ||
| JoŠKo | - | Croatian | ||
| JoŽIca | - | Slovene, Croatian | ||
| Jolanda | yo-LAHN-dah (Dutch, Italian) | Dutch, Slovene, Croatian, Italian | ||
| Josip | - | Croatian, Slovene | ||
| Josipa | - | Croatian | ||
| Joso | - | Croatian | ||
| Jozefina | - | Croatian | ||
| Jozo | - | Croatian | ||
| Julija | YOO-lee-yah (Slovene) | Slovene, Croatian, Lithuanian | ||
| Julijana | - | Slovene, Croatian, Serbian, Macedonian |