| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Kati | KAH-tee (Finnish) | Finnish, Estonian, Hungarian | ||
| Katica | - | Croatian, Slovene, Hungarian | ||
| KazimÍR | - | Czech, Slovak, Hungarian | ||
| Kelemen | - | Hungarian | ||
| KincsŐ | - | Hungarian | ||
| Kinga | KEEN-gah (Polish), KEEN-gaw (Hungarian) | Polish, Hungarian | ||
| Kitti | - | Hungarian | ||
| KlÁRa | - | Hungarian, Czech, Slovak | ||
| Klotild | - | Hungarian | ||
| 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 |