| Name | Meaning | Gender | Origin |
|---|
| Juggernaut | | Unisex | Hebrew |
| Julian | Jove's child. Form of Julius and family clan name of several powerful Roman emperors. Biblical Roman centurion Julius saved Paul's life during a hazardous voyage
| Male | English |
| Julius | after Julius Caesar | Male | Latin |
| Junior | Youthful person. Used to distinguish son from father where they have the same name | Male | Latin |
| Juniper | Juniper Tree | Female | English |
| Jurgen | German form of George
| Male | |
| Justin | just, true | Male | Latin |
| Justus | Just | Male | Roman |
| Kalamazoo | | Unisex | |
| Kami | Loving | Unisex | Hindu |
| Kane | tribute, warrior; the doubly-accomplished, golden; man, the eastern sky; beautiful | Male | Celtic |
| Karsten | Blessed or annointed one. Alternate Spelling: Carsten. Variant of Kristian.
| Male | Spelling |
| Kasimir | Famous, Great Destroyer | Unisex | Slavic |
| Keanu | cool breeze over the mountains | Male | Hawaiian |
| Keegan | A thinker: fiery. Form of Hugh.
| Male | Irish |
| Keenan | Ancient
| Male | Irish |
| Kegan | A thinker: fiery. Form of Hugh.
| Male | |
| Keifer | Barrelmaker Variation of Cooper. Surname.
| Male | |
| Keith | wood, wind; wood-dweller | Male | Scottish |
| Kelby | Dark: dark-haired.
| Male | English |
| Kelsey | Ceol's island, beautiful island; from the ship's island, shipping harbor | Female | English |
| Kelvin | name of a river; from the narrow river | Male | Scottish |
| Ken | Male Barbie Doll. | Male | English |
| Kenan | possession | Unisex | |
| Kendall | ruler of the valley | Female | English |