| Kaspar | | - | German | |
| Katarina | | kah-tah-REE-nah (German, Swedish) | German, Swedish, Norwegian, Danish, Hungarian, Croatian, Serbian, Slovene | |
| Katarine | | kah-tah-REE-nə | German | |
| Katharina | | kah-tah-REE-nah (German, Swedish) | German, Swedish, Norwegian, Danish | |
| Katharine | | KATH-ə-rin (English), KATH-rin (English), kah-tah-REE-nə (German) | English, German | |
| Katherina | | kath-ə-REE-nə (English), kə-THREE-nə (English), kah-te-REE-nah (German) | English (Rare), German | |
| Kathrin | | KAHT-reen | German | |
| Katinka | | kah-TING-kah (German) | German, Dutch | |
| Katja | | KAHT-yah (German, Dutch) | German, Swedish, Norwegian, Danish, Dutch, Slovene | |
| Katrin | | kah-TREEN (German, Swedish) | German, Swedish, Estonian | |
| Katrina | | kə-TREE-nə (English), kaht-REE-nah (Dutch) | English, German, Swedish, Dutch | |
| Kay (3) | | KIE (Swedish) | Frisian, German, Swedish, Norwegian, Danish | |
| Kayetan | | KAH-ye-tahn | German | |
| Kerstin | | SHESH-tin (Swedish), KER-stin (German) | Swedish, German | |
| Kevin | | KEV-in (English) | English, Irish, French, German, Dutch, Swedish, Norwegian, Danish | |