| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Kolos | KO-losh | Hungarian | ||
| KonrÁD | - | Hungarian, Czech, Slovak | ||
| Konstantin | KAWN-stahn-teen (German), kahn-stahn-TEEN (Russian) | German, Hungarian, Russian, Serbian, Bulgarian, Macedonian | ||
| KoppÁNy | - | Hungarian | ||
| KornÉL | KOR-nayl | Hungarian | ||
| KornÉLia | KOR-nay-lee-aw | Hungarian | ||
| Kotryna | - | Lithuanian | ||
| KristÓF | KREESH-tof | Hungarian | ||
| Kristijonas | - | Lithuanian | ||
| Kristina | kris-TEE-nah (German) | Swedish, Norwegian, Danish, Russian, German, Slovene, Czech, Lithuanian, Serbian, Croatian, Faroese, | ||
| Kristupas | - | Lithuanian | ||
| KrisztiÁN | KREES-tee-ahn | Hungarian | ||
| Krisztina | KREES-tee-naw | Hungarian | ||
| Kunzang | - | Tibetan, Bhutanese | ||
| LĖJa | - | Lithuanian |