| Name | Meaning | Gender | Origin |
|---|
| Juliet | youthful | Female | English |
| Julius | after Julius Caesar | Male | Latin |
| June | 6Th Month | Female | English |
| Juniper | Juniper Tree | Female | English |
| Juno | queen of the heavens | Female | Latin |
| Kachina | Sacred Dancer | Unisex | Native American |
| Kai | Fire
| Male | Hawaiian |
| Kalea | bright | Unisex | |
| Kali | after the Indian goddess of death | Female | Sanskrit |
| Kana | Powerful | Unisex | Japanese |
| Kane | tribute, warrior; the doubly-accomplished, golden; man, the eastern sky; beautiful | Male | Celtic |
| Kara | pure | Female | English |
| Karen | pure | Female | Danish |
| Kari | curly hair | Male | Norse |
| Karina | Italian, dear little one | Female | Scandinavian |
| Karma | Fate or destiny (Hinduism and Buddhism) | Female | Hindi |
| 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 |
| Kato | second of twins | Male | African |
| Katrina | Greek, pure | Female | |
| Kaya | my elder sister | Female | Native |
| Kayla | crown of laurels | Female | Arabic |
| Kayleigh | Slender | Unisex | English |
| Keefer | Barrelmaker Variation of Cooper. Surname.
| Male | |
| Keegan | A thinker: fiery. Form of Hugh.
| Male | Irish |
| Keenan | Ancient
| Male | Irish |