| Name | Meaning | Gender | Origin |
|---|
| Kelly | Lively: aggressive.
| Female | Irish |
| Kelsey | Ceol's island, beautiful island; from the ship's island, shipping harbor | Female | English |
| Kenner | | Unisex | |
| Kim | chief | Male | English |
| Kira | Dark Lady.
| Female | Russian |
| Kla | | Unisex | Hebrew |
| Klaewkla | | Unisex | |
| Klahan | Brave | Unisex | Thai |
| Koa | Hawaiian for strong | Unisex | |
| Konrad | Bold, Wise Councelor | Unisex | German |
| Leander | lion man | Male | Greek |
| Lennie | Brave Lion | Unisex | English |
| Lenny | brave lion | Male | English |
| Leonard | lion-hearted | Male | |
| Leonid | Lion | Male | Russian |
| Leopold | after Leopoldo in the movie Blood and Roses | Male | |
| Lewis | Renowned fighter. Form of Louis.
| Male | English |
| Lex | Protector Of Mankind | Male | English |
| Lightning | | Unisex | Hebrew |
| Lotta | | Female | |
| Louise | Renowned fighter. Feminine of Louis.
| Female | |
| Ludwig | Famous fighter
| Male | |
| Luther | Renowned warrior.
| Male | |
| Maia | nurse, mother, goddess of spring; great | Female | Greek |
| Marco | warlike | Male | Italian |