| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Klara | KLAH-rah (German, Russian, Polish) | Swedish, Norwegian, Danish, Icelandic, German, Russian, Ukrainian, Polish, Slovene, Croatian | ||
| Klaudia | KLOWT-yah (Polish) | Polish, Slovak | ||
| 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 | ||
| Klemens | KLE-mens (German, Polish) | German, Danish, Swedish, Polish | ||
| Klement | - | Czech, Slovak | ||
| Klementina | - | Slovene, Croatian | ||
| Kleon | - | Ancient Greek | ||
| Kleopas | - | Biblical Greek |