| Name | Meaning | Gender | Origin |
|---|
| King | King's field. King is one of several titles occasionally used as given names.
| Male | English |
| Kitty | Variant of Katherine. Pure.
| Female | English |
| Kitty | Variant of Katherine. Pure.
| Female | English |
| Kitty | Variant of Katherine. Pure.
| Female | English |
| Knight | Noble, Soldier | Male | English |
| Koko | stork | Female | Japanese |
| Leaf | | Male | |
| Leif | heir, descendant | Male | Scandinavian |
| Leila | dark as the night | Female | Persian |
| Lenore | Torch | Female | English |
| Lestat | | Unisex | Hebrew |
| Liam | Form of William.
| Male | Irish |
| Licorice | Confection made from the licorice root. | Unisex | |
| Lilith | character in Cheers | Female | Assyrian |
| Lilly | Lily | Female | English |
| Lindy | Serpent | Unisex | English |
| Lizzy | My G-D Is An Oath, Pledged To G-D | Unisex | English |
| Loki | To Break | Male | Norse |
| Lolly | | Unisex | |
| Lucifer | light-bearer | Male | Latin |
| Lucifer | light-bearer | Male | Latin |
| Lucretia | Riches | Female | Latin |
| Luke | Light | Male | Greek |
| Luna | moon | Female | Latin |
| Lurch | To stagger. | Unisex | |