| Name | Meaning | Gender | Origin |
|---|
| Jenny | Diminutive of Jane and Jennifer.
| Female | English |
| Jenny | Diminutive of Jane and Jennifer.
| Female | English |
| Jess | Gift | Male | English |
| Jinx | Charm, Spell | Female | Latin |
| Juliet | youthful | Female | English |
| Juliette | youthful | Female | |
| Julius | after Julius Caesar | Male | Latin |
| Juno | queen of the heavens | Female | Latin |
| Kat | pure | Female | English |
| Katniss | | Female | |
| Katniss | | Female | |
| Kiara | Italian, light, clear | Female | Spelling |
| Kirara | | Unisex | |
| Kitty | Variant of Katherine. Pure.
| Female | English |
| Kitty | Variant of Katherine. Pure.
| Female | English |
| Kitty | Variant of Katherine. Pure.
| Female | English |
| Koda | | Male | |
| Kovu | | Unisex | |
| Krazy Kat | | Unisex | Hebrew |
| Lady | A female title of nobility. | Female | |
| Leeloo | after the character in the movie The Fifth Element | Unisex | |
| Lena | Alluring, Temptress, Light | Female | Greek |
| Little John | | Male | |
| Lolita | Spanish, lady of sorrows | Female | Spanish |
| Lucifer | light-bearer | Male | Latin |