| 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 | |
| Katrina | | kə-TREE-nə (English), kaht-REE-nah (Dutch) | English, German, Swedish, Dutch | |
| Kay (3) | | KIE (Swedish) | Frisian, German, Swedish, Norwegian, Danish | |
| Kennet | | - | Swedish, Norwegian, Danish | |
| Kenneth | | KEN-ith (Scottish, English) | Scottish, English, Swedish, Norwegian, Danish | |
| Kerstin | | SHESH-tin (Swedish), KER-stin (German) | Swedish, German | |
| Kettil | | - | Swedish | |
| Kevin | | KEV-in (English) | English, Irish, French, German, Dutch, Swedish, Norwegian, Danish | |
| Kia | | KEE-ah | Swedish | |
| Kim (2) | | KEEM (Finnish) | Danish, Swedish, Norwegian, Finnish | |
| Kjell | | SHEL | Swedish, Norwegian | |