| Jasna | | - | Croatian, Serbian, Slovene, Macedonian | |
| Joakim | | YO-ah-kim (Swedish), YO-ah-keem (Finnish) | Swedish, Norwegian, Danish, Finnish, Serbian, Macedonian | |
| Jordan | | JAWR-dən (English) | English, Macedonian | |
| Jordana | | hor-DAH-nah (Spanish), jawr-DAN-ə (English) | Spanish, Portuguese, Macedonian, English (Rare) | |
| Josif | | - | Serbian, Macedonian | |
| Jovan | | - | Serbian, Macedonian | |
| Jovana | | - | Serbian, Macedonian | |
| Jovanka | | - | Serbian, Macedonian | |
| Jovka | | - | Macedonian | |
| Julijana | | - | Slovene, Croatian, Serbian, Macedonian | |
| Kalina | | - | Bulgarian, Macedonian, Polish | |
| Karolina | | kah-raw-LEE-nah (Polish), kah-ro-LEE-nah (Swedish, German) | Polish, Swedish, Norwegian, Danish, Hungarian, Slovene, Croatian, Macedonian, Lithuanian, German | |
| Katerina | | - | Macedonian, Russian, Bulgarian, Greek, Late Roman | |
| Katina | | - | Greek, Macedonian | |
| Kire | | - | Macedonian | |