| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Klementina | - | Slovene, Croatian | ||
| Koraljka | - | Croatian | ||
| Kornelija | - | Croatian, Serbian | ||
| KreŠImir | - | Croatian | ||
| KreŠImira | - | Croatian | ||
| KreŠO | - | Croatian | ||
| Kristijan | KREES-tee-yahn (Serbian, Croatian) | Serbian, Croatian, Slovene, Macedonian | ||
| Kristina | kris-TEE-nah (German) | Swedish, Norwegian, Danish, Russian, German, Slovene, Czech, Lithuanian, Serbian, Croatian, Faroese, | ||
| Kristofor | - | Croatian (Rare) | ||
| Krsto | - | Croatian | ||
| Kruno | - | Croatian | ||
| Krunoslav | - | Croatian | ||
| Ksenija | - | Serbian, Croatian, Macedonian, Slovene |