| Name | Meaning | Gender | Origin |
|---|
| Jubilee | ram's horn | Female | Hebrew |
| Juniper | Juniper Tree | Female | English |
| Juno | queen of the heavens | Female | Latin |
| Karma | Fate or destiny (Hinduism and Buddhism) | Female | Hindi |
| Katana | Sword | Unisex | Japanese |
| Katherine | Pure. Used since third century A.D. Early Latin forms Katerina and Caterina became Katharine and Catherine. French Cateline and English Catlyn came into wider use during medieval period when variants multiplied.
| Female | Greek |
| Katniss | | Female | |
| Katniss | | Female | |
| Kelly | Lively: aggressive.
| Female | Irish |
| Kid | | Unisex | Hebrew |
| Kinsey | victorious prince | Female | English |
| Kismet | fate, destiny | Female | Word |
| Kitty | Variant of Katherine. Pure.
| Female | English |
| Kitty | Variant of Katherine. Pure.
| Female | English |
| Kitty | Variant of Katherine. Pure.
| Female | English |
| Knockout | | Unisex | Hebrew |
| Lady | A female title of nobility. | Female | |
| Lara | citadel | Female | Russian |
| Laura | bay laurel | Female | Latin |
| Laurel | Laurel
| Female | Latin |
| Leonora | Light | Female | Italian |
| Liberty | Free
| Female | Word |
| Lightning | | Unisex | Hebrew |
| Lilith | character in Cheers | Female | Assyrian |
| Liz | Hebrew, pledged to God | Female | English |