| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Katalin | KAWT-aw-leen (Hungarian) | Hungarian, Basque | ||
| Katalinka | - | Hungarian | ||
| Katarina | kah-tah-REE-nah (German, Swedish) | German, Swedish, Norwegian, Danish, Hungarian, Croatian, Serbian, Slovene | ||
| Kati | KAH-tee (Finnish) | Finnish, Estonian, Hungarian | ||
| Katica | - | Croatian, Slovene, Hungarian | ||
| KatrĖ | - | Lithuanian | ||
| Kay (2) | - | Welsh Mythology, Arthurian Romance | ||
| KazimÍR | - | Czech, Slovak, Hungarian | ||
| Kazimieras | - | Lithuanian | ||
| Kelemen | - | Hungarian | ||
| KincsŐ | - | Hungarian | ||
| Kinga | KEEN-gah (Polish), KEEN-gaw (Hungarian) | Polish, Hungarian | ||
| Kitti | - | Hungarian | ||
| KlÁRa | - | Hungarian, Czech, Slovak | ||
| Klotild | - | Hungarian |