| Name | Meaning | Gender | Origin |
|---|
| Isabel | concecrated to God | Female | Spanish |
| Isabella | pledged to God | Female | Spanish |
| Isabelle | pledged to God | Female | |
| Jade | Jewel. Courageous and adoring.
| Female | Spanish |
| Japan | | Unisex | Hebrew |
| Jasmine | Flower
| Female | Persian |
| Java | Brewed coffee | Female | Anglicization |
| Jazmyn | Jasmine | Unisex | Persian |
| Jenna | white shadow, white wave | Female | English |
| Jessica | God's grace | Female | Hebrew |
| Joliet | | Unisex | Hebrew |
| Josephine | God will increase | Female | |
| Julia | Youthful
| Female | Latin |
| 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 |
| Katie | Variant of Katherine. Pure.
| Female | English |
| Kayla | crown of laurels | Female | Arabic |
| Kaylee | Arabic and Hebrew, laurel, crown | Female | American |
| Kelsey | Ceol's island, beautiful island; from the ship's island, shipping harbor | Female | English |
| Kendall | ruler of the valley | Female | English |
| Kidd | | Unisex | |
| Kila | | Unisex | |
| Kinsey | victorious prince | Female | English |
| Kismet | fate, destiny | Female | Word |
| Kruger | | Unisex | Hebrew |
| Kylie | Boomerang. Feminine form of Kyle.
| Female | Aboriginal |