| Name | Meaning | Gender | Origin |
|---|
| Jennifer | white shadow, white wave | Female | Cornish |
| Jessica | God's grace | Female | Hebrew |
| Jezebel | follower of idols | Female | Hebrew |
| Josephine | God will increase | Female | |
| Joyce | after James Augustine Aloysius Joyce, Irish writer and poet | Female | Latin |
| Julia | Youthful
| Female | Latin |
| Juliet | youthful | Female | English |
| Kasia | Pure | Female | Polish |
| 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 |
| Kayla | crown of laurels | Female | Arabic |
| Kaylee | Arabic and Hebrew, laurel, crown | Female | American |
| Kayleigh | Slender | Unisex | English |
| Kaylen | Variant Of Kay And Kayla. Keeper Of The Keys; Pure. | Unisex | English |
| Kelsey | Ceol's island, beautiful island; from the ship's island, shipping harbor | Female | English |
| 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 |
| Kiri | tree bark | Female | Maori |
| Kitty | Variant of Katherine. Pure.
| Female | English |
| Kitty | Variant of Katherine. Pure.
| Female | English |
| Kitty | Variant of Katherine. Pure.
| Female | English |
| Lacey | Cheerful One | Female | English |
| Laila | Night, dark beauty.
| Female | Spelling |
| Lanie | | Unisex | |
| Laura | bay laurel | Female | Latin |
| Laurel | Laurel
| Female | Latin |