| Name | Meaning | Gender | Origin |
|---|
| James | From Jacob - To fill the place of another, supplanter. | Male | English |
| Jasmine | Flower
| Female | Persian |
| Jasper | Black stone
| Male | Persian |
| Jasper | Black stone
| Male | Persian |
| Jasper | Black stone
| Male | Persian |
| Jenna | white shadow, white wave | Female | English |
| 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 |
| Jules | youthful; soft, downy | Male | |
| Julia | Youthful
| Female | Latin |
| Juliet | youthful | Female | English |
| Kade | From the wetlands.
| Male | Spelling |
| Kai | Fire
| Male | Hawaiian |
| 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 |
| Keith | wood, wind; wood-dweller | Male | Scottish |
| Kelsey | Ceol's island, beautiful island; from the ship's island, shipping harbor | Female | English |
| Kendall | ruler of the valley | Female | English |