| Name | Meaning | Gender | Origin |
|---|
| Julius | after Julius Caesar | Male | Latin |
| Jumbo | Unusually large person, animal or thing e.g. Jumbo Jet. From African 'jumba' meaning elephant. | Male | |
| June | 6Th Month | Female | English |
| Justin | just, true | Male | Latin |
| Kai | Fire
| Male | Hawaiian |
| Kanada | | Unisex | Hebrew |
| 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 |
| Katayama | | Unisex | Hebrew |
| Kazuo | Harmonious Man | Unisex | Japanese |
| Keegan | A thinker: fiery. Form of Hugh.
| Male | Irish |
| Keith | wood, wind; wood-dweller | Male | Scottish |
| Kel | | Unisex | Hebrew |
| Kelly | Lively: aggressive.
| Female | Irish |
| Ken | Male Barbie Doll. | Male | English |
| Kendall | ruler of the valley | Female | English |
| Kennedy | misshapen head | Female | Irish |
| Kenny | English, born of fire, handsome | Male | English |
| Keoke | | Unisex | |
| Kermit | free man | Male | Irish |
| Kevin | handsome | Male | Irish |
| Khan | An Indian ruler or official | Unisex | |
| Kidd | | Unisex | |
| Kiefer | barrel-maker | Male | |
| Kim | chief | Male | English |