| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Klement | - | Czech, Slovak | ||
| Klementina | - | Slovene, Croatian | ||
| Kleon | - | Ancient Greek | ||
| Kleopas | - | Biblical Greek | ||
| Kleopatra | - | Ancient Greek | ||
| Kleopatros | - | Ancient Greek | ||
| Klim | - | Russian, Ukrainian | ||
| Kliment | klee-MYENT (Russian) | Russian, Ukrainian, Bulgarian, Macedonian | ||
| Klimentina | - | Macedonian | ||
| Klopas | - | Biblical Greek | ||
| Klotild | - | Hungarian | ||
| KnÚTr | - | Ancient Scandinavian | ||
| Knud | KNOOD | Danish | ||
| Knut | KNOOT (German) | Swedish, Norwegian, Danish, German | ||
| Knute | - | Norwegian |