| Name | Meaning | Gender | Origin |
|---|
| Jagger | a teamster | Male | English |
| Jake | From Jacob - To fill the place of another | Male | Hebrew |
| Jarrett | Irish variation of Gerard, spear strength | Male | English |
| Jasmine | Flower
| Female | Persian |
| Jason | the Lord is salvation | Male | Hebrew |
| Jax | God has been gracious: has shown favor. Based on John or Jacques.
| Male | Modern |
| Jet | A deep black colour. Aircraft engine that propels an aircraft forward by expelling exhaust gases toward the rear. | Male | Mineral |
| Jeter | after Derek Sanderson Jeter, Yankee's shortstop | Male | |
| Jezebel | follower of idols | Female | Hebrew |
| Jock | God has been gracious: has shown favor. Based on John or Jacques.
| Male | Scottish |
| John | God is merciful | Male | Hebrew |
| Jolie | French for pretty | Female | |
| Judy | Hebrew, He will be praised, woman from Judea | Female | English |
| Juliet | youthful | Female | English |
| Julius | after Julius Caesar | Male | Latin |
| Junior | Youthful person. Used to distinguish son from father where they have the same name | Male | Latin |
| Jupiter | Zeus, Father | Male | Roman |
| Kade | From the wetlands.
| Male | Spelling |
| Kaiser | Any of the emperors of The Holy Roman Empire, Austria or Germany | Unisex | |
| 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 |
| Katrina | Greek, pure | Female | |
| Kennedy | misshapen head | Female | Irish |
| Keno | | Unisex | Hebrew |
| Kevin | handsome | Male | Irish |
| Killian | church | Male | Irish |