| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Kjerstin | SHESH-tin (Swedish) | Norwegian, Swedish | ||
| Kjetil | - | Norwegian | ||
| KlĀRa | - | Latvian | ||
| KlÁRa | - | Hungarian, Czech, Slovak | ||
| Klaas | KLAH:S | Dutch, Low German | ||
| Klaes | - | Frisian | ||
| Klara | KLAH-rah (German, Russian, Polish) | Swedish, Norwegian, Danish, Icelandic, German, Russian, Ukrainian, Polish, Slovene, Croatian | ||
| Klaudija | - | Croatian | ||
| Klaudijs | - | Latvian | ||
| Klaudio | - | Croatian | ||
| Klaus | KLOWS (German, Finnish) | German, Danish, Norwegian, Finnish | ||
| Klava | - | Russian | ||
| Klavdiya | KLAHV-dee-yah (Russian) | Russian, Ukrainian, Bulgarian | ||
| Kleisthenes | - | Ancient Greek | ||
| Kleitos | - | Ancient Greek |