| Name | Meaning | Gender | Origin |
|---|
| Iris | rainbow, a play of colours | Female | |
| Ishtar | goddess | Unisex | |
| Isolde | beautiful | Female | Welsh |
| Jerry | after Jerry Garcia, The Grateful Dead | Male | English |
| Juliet | youthful | Female | English |
| Kalila | beloved | Female | Arabic |
| Kalina | Flower
| Female | |
| King | King's field. King is one of several titles occasionally used as given names.
| Male | English |
| Kinky | | Unisex | |
| Kit Kat | | Unisex | |
| Kit Kat | | Unisex | |
| Kitten | | Unisex | |
| Kitty | Variant of Katherine. Pure.
| Female | English |
| Kitty | Variant of Katherine. Pure.
| Female | English |
| Kitty | Variant of Katherine. Pure.
| Female | English |
| Lady | A female title of nobility. | Female | |
| Lady Bug | | Unisex | |
| Lamb | | Unisex | |
| Lancelot | Knight of Arthur and lover of Guinevere
| Male | |
| Layla | night | Female | Arabic |
| Layla | night | Female | Arabic |
| Leander | lion man | Male | Greek |
| Lion | Lion | Unisex | English |
| Lips | | Unisex | |
| Little | | Male | Hebrew |