| Kaja (1) | | KAH-yah (Swedish, Estonian) | Norwegian, Danish, Swedish, Estonian, Slovene | |
| Kajsa | | KIE-sah | Swedish | |
| Kalle | | KAHL-le (Finnish) | Swedish, Finnish | |
| Kamilla | | - | Hungarian, Swedish, Norwegian, Danish | |
| Karin | | KAH-rin (Swedish, German, Dutch), KAH-reen (Finnish), KER-ən (English), KAR-ən (English) | Swedish, Norwegian, Danish, German, Dutch, Finnish, English | |
| Karina | | kah-REE-nah (Swedish, Polish, German, Russian), kə-REE-nə (English) | Swedish, Danish, Norwegian, Polish, German, Russian, English | |
| Karita | | kah-REE-tah | Swedish | |
| Karl | | KAHRL (German, Danish, English, Finnish) | German, Swedish, Norwegian, Danish, English, Finnish, Ancient Germanic | |
| Karla | | KAHR-lah (German) | German, Swedish, Norwegian, Danish, Croatian | |
| Karolina | | kah-raw-LEE-nah (Polish), kah-ro-LEE-nah (Swedish, German) | Polish, Swedish, Norwegian, Danish, Hungarian, Slovene, Croatian, Macedonian, Lithuanian, German | |
| Kasper | | KAHS-per (Polish, Swedish), KAHS-pər (Dutch) | Polish, Dutch, Swedish, Norwegian, Danish | |
| Katarina | | kah-tah-REE-nah (German, Swedish) | German, Swedish, Norwegian, Danish, Hungarian, Croatian, Serbian, Slovene | |
| Katharina | | kah-tah-REE-nah (German, Swedish) | German, Swedish, Norwegian, Danish | |
| Katja | | KAHT-yah (German, Dutch) | German, Swedish, Norwegian, Danish, Dutch, Slovene | |
| Katrin | | kah-TREEN (German, Swedish) | German, Swedish, Estonian | |