| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Krastio | - | Bulgarian | ||
| Krastyo | - | Bulgarian | ||
| Krastyu | - | Bulgarian | ||
| Kristiyan | - | Bulgarian | ||
| Kuzman | - | Bulgarian, Serbian, Macedonian | ||
| Lala | - | Bulgarian | ||
| Lazar | LAH-zahr (Russian, Serbian, Croatian) | Russian, Bulgarian, Serbian, Croatian, Macedonian | ||
| Lidiya | LEE-dee-yah (Russian) | Russian, Bulgarian | ||
| Liliya | - | Russian, Ukrainian, Bulgarian | ||
| Lilyana | - | Bulgarian | ||
| Luben | - | Bulgarian | ||
| Lubomir | - | Bulgarian | ||
| Ludmilla | - | Russian, Bulgarian | ||
| Lyuben | - | Bulgarian | ||
| Lyubomir | - | Bulgarian, Medieval Slavic |