| Kacey | Irish | Eagle-Eyed |
| Kai | ... | ... |
| Kaia | ... | ... |
| Kali | Greek | Rosebud |
| Kalia | Hawaiian | Beauty |
| Kameron | ... | ... |
| Kamryn | ... | ... |
| Kara | Latin | Dear One |
| Karen, Karena | Greek | Pure One |
| Karissa | ... | ... |
| Karla | ... | ... |
| Kassia | Greek | Pure |
| Kate, Katie | Greek | Pure |
| Katherine, Kathy, Kathleen | Greek | Pure |
| Katrina |
|
Variant of Katherine |
| Kay | Greek | Rejoicing |
| Kayla |
|
Variant of Kay |
| Kayden | ... | ... |
| Kayla | ... | ... |
| Kaylen | ... | ... |
| Kayley | ... | ... |
| Kayli | ... | ... |
| Kaylyn | ... | ... |
| Keely | Celtic | Beauty |
| Keaton | ... | ... |
| Keira | ... | ... |
| Kellen | ... | ... |
| Kelly | English | Beautiful |
| Kelsie | ... | ... |
| Kendall | ... | ... |
| Kenia | ... | ... |
| Kenna | ... | ... |
| Kennedy | ... | ... |
| Kelsey | Irish Gaelic | Warrior |
| Kendra | Old English | Wise |
| Kerri | Irish Gaelic | Dark-Haired |
| Kiersten | ... | ... |
| Kiley | ... | ... |
| Kimberly | ... | ... |
| Kimora | ... | ... |
| Kinsley | ... | ... |
| Kira | ... | ... |
| Kirby | Anglo Saxon | Church Town |
| Kirstyn, Kirsten | Scandinavian | Annointed One |
| Kit |
|
Nickname for Katharine |
| Kristina | ... | ... |
| Krystal | ... | ... |
| Kyla, Kyle | Scottish Gaelic | Lovely |
| Kylie | ... | ... |
| Kyra | ... | ... |