| Name | Meaning | Gender | Origin |
|---|
| Jumper | | Male | Hebrew |
| Jumpy | | Unisex | Hebrew |
| Junior | Youthful person. Used to distinguish son from father where they have the same name | Male | Latin |
| Jupiter | Zeus, Father | Male | Roman |
| Jurgen | German form of George
| Male | |
| Just | | Unisex | Hebrew |
| Jynx | Charm, Spell | Unisex | Latin |
| Kabuki | Type Of Drama | Male | Japanese |
| Kafka | jackdaw | Male | Czech |
| Kahlua | | Unisex | |
| Kahuna | | Unisex | |
| Kaiser | Any of the emperors of The Holy Roman Empire, Austria or Germany | Unisex | |
| Kalamazoo | | Unisex | |
| Kandy | Cutie
| Male | |
| Kane | tribute, warrior; the doubly-accomplished, golden; man, the eastern sky; beautiful | Male | Celtic |
| Kannika | Japanese for jasmine like blossom | Unisex | |
| Kasha | | Unisex | Hebrew |
| Kawaii | | Unisex | |
| Kazak | | Male | Hebrew |
| Keanu | cool breeze over the mountains | Male | Hawaiian |
| Keegan | A thinker: fiery. Form of Hugh.
| Male | Irish |
| Keeper | | Unisex | Hebrew |
| Keifer | Barrelmaker Variation of Cooper. Surname.
| Male | |
| Keiki | Child | Unisex | Italian |
| Keller | cellar master | Male | |