| Kata | | KAH-tah (Finnish) | Hungarian, Finnish, Croatian | |
| 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 | |