| Julianna | | yuw-lee-AHN-nah (Polish), joo-lee-AHN-ə (English) | Hungarian, Polish, English | |
| Juliska | | - | Hungarian | |
| KÁLmÁN | | - | Hungarian | |
| KÁRoly | | KAH-roi | Hungarian | |
| KÁZmÉR | | - | Hungarian | |
| KajetÁN | | - | Czech, Slovak, Hungarian | |
| Kamilla | | - | Hungarian, Swedish, Norwegian, Danish | |
| Karcsi | | - | Hungarian | |
| 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 | |
| KatÓ | | - | Hungarian | |
| Kata | | KAH-tah (Finnish) | Hungarian, Finnish, Croatian | |
| Katalin | | KAWT-aw-leen (Hungarian) | Hungarian, Basque | |
| Katalinka | | - | Hungarian | |
| Katarina | | kah-tah-REE-nah (German, Swedish) | German, Swedish, Norwegian, Danish, Hungarian, Croatian, Serbian, Slovene | |