| Kornelija | | - | Croatian, Serbian | |
| Kristijan | | KREES-tee-yahn (Serbian, Croatian) | Serbian, Croatian, Slovene, Macedonian | |
| Kristina | | kris-TEE-nah (German) | Swedish, Norwegian, Danish, Russian, German, Slovene, Czech, Lithuanian, Serbian, Croatian, Faroese, | |
| Ksenija | | - | Serbian, Croatian, Macedonian, Slovene | |
| Kuzman | | - | Bulgarian, Serbian, Macedonian | |
| Lana | | LAH-nə (English) | English, Russian, Croatian, Serbian | |
| Lazar | | LAH-zahr (Russian, Serbian, Croatian) | Russian, Bulgarian, Serbian, Croatian, Macedonian | |
| Lidija | | - | Slovene, Croatian, Serbian, Macedonian | |
| Ljerka | | - | Croatian, Serbian, Slovene | |
| Ljilja | | - | Serbian | |
| Ljiljana | | - | Serbian, Croatian | |
| Ljuba | | LYOO-bah (Serbian, Croatian) | Serbian, Croatian, Czech, Slovene, Macedonian | |
| Ljuban | | LYOO-bahn | Serbian, Croatian | |
| Ljubica | | LYOO-bee-tsah (Serbian, Croatian) | Serbian, Croatian, Macedonian, Slovene | |
| Ljubo | | LYOO-bo | Croatian, Serbian | |