| 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 | |
| Kjerstin | | SHESH-tin (Swedish) | Norwegian, Swedish | |
| Klara | | KLAH-rah (German, Russian, Polish) | Swedish, Norwegian, Danish, Icelandic, German, Russian, Ukrainian, Polish, Slovene, Croatian | |
| Klas | | KLAHS | Swedish | |
| Klemens | | KLE-mens (German, Polish) | German, Danish, Swedish, Polish | |
| Knut | | KNOOT (German) | Swedish, Norwegian, Danish, German | |