| Krsto | | - | Croatian | |
| Kruno | | - | Croatian | |
| Krunoslav | | - | Croatian | |
| Ksenija | | - | Serbian, Croatian, Macedonian, Slovene | |
| Ladislav | | - | Czech, Slovak, Slovene, Croatian | |
| Lana | | LAH-nə (English) | English, Russian, Croatian, Serbian | |
| Lara (1) | | LAHR-ə (English), LAH-rah (German, Italian, Spanish, Portuguese) | Russian, English, German, French, Italian, Spanish, Portuguese, Dutch, Hungarian, Slovene, Croatian | |
| Laura | | LAWR-ə (English), LOW-rah (Spanish, Italian, Finnish, Polish, Swedish, Norwegian, Danish, German, Dutch), LAW-oo-raw (Hungarian) | English, Spanish, Italian, Portuguese, Romanian, Finnish, Estonian, Hungarian, Polish, Slovene, Croa | |
| Lazar | | LAH-zahr (Russian, Serbian, Croatian) | Russian, Bulgarian, Serbian, Croatian, Macedonian | |
| Lea | | LE-ah (German, Finnish) | German, Dutch, Swedish, Norwegian, Danish, Finnish, Slovene, Croatian | |
| Leo | | LE-o (German, Finnish), LAY-o (Dutch), LEE-o (English) | German, Dutch, Swedish, Norwegian, Danish, Finnish, English, Croatian, Late Roman | |
| Leon | | LEE-awn (English), LE-awn (German, Polish) | English, German, Polish, Slovene, Croatian, Dutch, Ancient Greek | |
| Lidija | | - | Slovene, Croatian, Serbian, Macedonian | |
| Lina (2) | | - | English, Italian, Swedish, Danish, Norwegian, Lithuanian, Croatian | |
| Ljerka | | - | Croatian, Serbian, Slovene | |