| Name | Meaning | Gender | Origin |
|---|
| Katerina | Blessed, Pure, Holy | Unisex | Czechoslovakian |
| 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 |
| Katie | Variant of Katherine. Pure.
| Female | English |
| Kewpie | | Unisex | Hebrew |
| Kiki | From Enriqueta - Pet | Female | |
| Kiki | From Enriqueta - Pet | Female | |
| Kit | Nickname for Christopher. Frontiersman Kit Carson.
| Male | English |
| Kit Kat | | Unisex | |
| Kit Kat | | Unisex | |
| Kitkat | | Unisex | Hebrew |
| Kitty | Variant of Katherine. Pure.
| Female | English |
| Kitty | Variant of Katherine. Pure.
| Female | English |
| Kitty | Variant of Katherine. Pure.
| Female | English |
| Kiwi | | Unisex | Hebrew |
| Koda | | Male | |
| Kona | Dark rich coffee blend from Hawaii. | Unisex | |
| Lacey | Cheerful One | Female | English |
| Lady | A female title of nobility. | Female | |
| Ladybug | | Female | Hebrew |
| Leeloo | after the character in the movie The Fifth Element | Unisex | |
| Lena | Alluring, Temptress, Light | Female | Greek |
| Leo | Lion.
| Male | Latin |
| Libby | Diminutive of Elizabeth.
| Female | English |
| Lila | night | Female | Arabic |
| Lillian | lily, a flower | Female | English |