| Kevin | | KEV-in (English) | English, Irish, French, German, Dutch, Swedish, Norwegian, Danish | |
| Klaas | | KLAH:S | Dutch, Low German | |
| Klasina | | klah-SEE-nah | Dutch | |
| Klazina | | klah-ZEE-nah | Dutch | |
| Kobe (1) | | - | Dutch | |
| Kobus | | KO-bus | Dutch | |
| Koen | | KOON | Dutch | |
| Koenraad | | KOON-rah:t | Dutch | |
| Koert | | KOORT | Dutch | |
| Koos | | KO:S | Dutch | |
| Kunigonde | | - | Dutch | |
| Lambert | | LAHM-bert (German), LAHM-bərt (Dutch), lam-BER (French), LAM-bərt (English) | German, Dutch, French, English, Ancient Germanic | |
| Lammert | | LAHM-mərt | Dutch | |
| Lara (1) | | LAHR-ə (English), LAH-rah (German, Italian, Spanish, Portuguese) | Russian, English, German, French, Italian, Spanish, Portuguese, Dutch, Hungarian, Slovene, Croatian | |
| Lars | | LAHSH (Swedish, Norwegian), LAHRS (Danish, Finnish) | Swedish, Norwegian, Danish, Finnish, Dutch, German | |