| Name | Meaning | Gender | Origin |
|---|
| Kelloggs | | Male | Hebrew |
| Kelly | Lively: aggressive.
| Female | Irish |
| Keondra | Goddess
| Female | |
| Kesha | | Female | |
| Kiana | Variant of Kian. Ancient.
| Female | Modern |
| Kikki | | Male | Hebrew |
| King | King's field. King is one of several titles occasionally used as given names.
| Male | English |
| Kira | Dark Lady.
| Female | Russian |
| Kitto | Greek and Latin, bearer of Christ | Male | Cornish |
| Kitty | Variant of Katherine. Pure.
| Female | English |
| Kitty | Variant of Katherine. Pure.
| Female | English |
| Kitty | Variant of Katherine. Pure.
| Female | English |
| Knuckles | | Male | Hebrew |
| Koko And Yumyum | | Unisex | Hebrew |
| Kyle | A place-name referring to the narrows: a wood or a church.
| Male | Scottish |
| Lai Tai | | Unisex | Hebrew |
| Lama | | Male | |
| Lambert | Light of land
| Male | |
| Lancelot | Knight of Arthur and lover of Guinevere
| Male | |
| Larry | Abbreviation of Lawrence or Laurence often used as an independent name.
| Male | English |
| Lavender | Lavender, A Purple Flower | Female | English |
| Leather | | Male | |
| Lee Jordan | Gryffindor student.
| Male | |
| Leia | Weary | Unisex | Hebrew |
| Lenny And Squiggy | | Unisex | Hebrew |