| Kliment | | klee-MYENT (Russian) | Russian, Ukrainian, Bulgarian, Macedonian | |
| Kostyantyn | | - | Ukrainian | |
| Kyrylo | | - | Ukrainian | |
| Larisa | | lah-REE-sah (Russian) | Russian, Ukrainian, Romanian, Latvian, Greek Mythology | |
| Larysa | | - | Ukrainian | |
| Leonid | | lye-ah-NEET (Russian), lee-ah-NEET (Russian) | Russian, Ukrainian | |
| Lera | | - | Russian, Ukrainian | |
| Lesya | | - | Ukrainian | |
| Lilia | | - | Russian, Ukrainian | |
| Liliya | | - | Russian, Ukrainian, Bulgarian | |
| Lilya | | - | Russian, Ukrainian | |
| Luba | | - | Russian, Ukrainian | |
| Lyuba | | - | Russian, Ukrainian | |
| Lyubochka | | - | Russian, Ukrainian | |
| Lyubov | | lyoo-BOF (Russian) | Russian, Bulgarian, Ukrainian | |