| Name | Meaning | Gender | Origin |
|---|
| Keegan | A thinker: fiery. Form of Hugh.
| Male | Irish |
| Keely | Beautiful | Unisex | Irish |
| Keira | after the actress Keira Knightley | Female | Irish |
| Keirsten | Variant of Kirsten.
| Female | |
| Kendall | ruler of the valley | Female | English |
| Kendra | Blend of Ken: (royal obligation:clear water) and Sandra: (protector of man) or Andrea: (manly or masculine).
| Female | English |
| Kennedy | misshapen head | Female | Irish |
| Kenya | Animal Horn | Female | Hebrew |
| Keziah | cassia tree | Female | Hebrew |
| Kira | Dark Lady.
| Female | Russian |
| Kirby | church settlement | Male | Norse |
| Kit | Nickname for Christopher. Frontiersman Kit Carson.
| Male | English |
| Korra | | Unisex | |
| Laine | From the long meadow
| Male | |
| Lane | narrow road | Male | English |
| Lara | citadel | Female | Russian |
| Layla | night | Female | Arabic |
| Layla | night | Female | Arabic |
| Leia | Weary | Unisex | Hebrew |
| Leila | dark as the night | Female | Persian |
| Lela | Night | Unisex | Arabic |
| Lennon | small cloak or cape | Male | Irish |
| Lexi | Greek, feminine form of Alexander, defending men | Female | English |
| Lila | night | Female | Arabic |
| Lilac | Bluish Purple | Female | Latin |