| Name | Meaning | Gender | Origin |
|---|
| Jose | Jehovah increases | Male | Spanish |
| Josie | From Josephine - She shall add. | Female | English |
| Jovi | after Jon Bon Jovi | Unisex | |
| Joy | From Joyce - Gay and joyful | Female | Word |
| Juice | | Unisex | Hebrew |
| Jules | youthful; soft, downy | Male | |
| Jumper | | Male | Hebrew |
| Junior | Youthful person. Used to distinguish son from father where they have the same name | Male | Latin |
| Juniper | Juniper Tree | Female | English |
| Juno | queen of the heavens | Female | Latin |
| Kai | Fire
| Male | Hawaiian |
| Kaiser | Any of the emperors of The Holy Roman Empire, Austria or Germany | Unisex | |
| Kandy | Cutie
| Male | |
| Kane | tribute, warrior; the doubly-accomplished, golden; man, the eastern sky; beautiful | Male | Celtic |
| Karma | Fate or destiny (Hinduism and Buddhism) | Female | Hindi |
| Katie | Variant of Katherine. Pure.
| Female | English |
| Kelly | Lively: aggressive.
| Female | Irish |
| Kiki | From Enriqueta - Pet | Female | |
| Kiki | From Enriqueta - Pet | Female | |
| Killian | church | Male | Irish |
| Kira | Dark Lady.
| Female | Russian |
| Kismet | fate, destiny | Female | Word |
| Kit Kat | | Unisex | |
| Kit Kat | | Unisex | |
| Kitty | Variant of Katherine. Pure.
| Female | English |