| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| KĘStutis | - | Lithuanian | ||
| KÁLmÁN | - | Hungarian | ||
| KÁRoly | KAH-roi | Hungarian | ||
| KÁZmÉR | - | Hungarian | ||
| KajetÁN | - | Czech, Slovak, Hungarian | ||
| Kajus | - | Lithuanian | ||
| KamilĖ | - | Lithuanian | ||
| Kamilla | - | Hungarian, Swedish, Norwegian, Danish | ||
| Karcsi | - | Hungarian | ||
| Karma | - | Bhutanese | ||
| Karola | KAW-ro-law (Hungarian), kah-RO-lah (German) | Hungarian, German | ||
| Karolina | kah-raw-LEE-nah (Polish), kah-ro-LEE-nah (Swedish, German) | Polish, Swedish, Norwegian, Danish, Hungarian, Slovene, Croatian, Macedonian, Lithuanian, German | ||
| Karolis | - | Lithuanian | ||
| Kasparas | - | Lithuanian | ||
| KatÓ | - | Hungarian |