| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Kalyna | kah-LI-nah | Ukrainian (Rare) | ||
| Kateryna | kah-te-RI-nah | Ukrainian | ||
| Khrystyna | - | Ukrainian | ||
| Klara | KLAH-rah (German, Russian, Polish) | Swedish, Norwegian, Danish, Icelandic, German, Russian, Ukrainian, Polish, Slovene, Croatian | ||
| Klavdiya | KLAHV-dee-yah (Russian) | Russian, Ukrainian, Bulgarian | ||
| Klim | - | Russian, Ukrainian | ||
| Kliment | klee-MYENT (Russian) | Russian, Ukrainian, Bulgarian, Macedonian | ||
| Kostyantyn | - | Ukrainian | ||
| Kyrylo | - | Ukrainian |