| Name | Meaning | Gender | Origin |
|---|
| Jasmine | Flower
| Female | Persian |
| Jasper | Black stone
| Male | Persian |
| Jasper | Black stone
| Male | Persian |
| Jasper | Black stone
| Male | Persian |
| Jax | God has been gracious: has shown favor. Based on John or Jacques.
| Male | Modern |
| Jedda | | Male | Hebrew |
| Jemma | Italian, precious stone | Female | Spelling |
| Jess | Gift | Male | English |
| Jesse | wealthy | Male | Hebrew |
| Jessie | wealthy | Female | Anglicized |
| Jessy | God's Gracious Gift | Unisex | Hebrew |
| Jingles | | Unisex | Hebrew |
| Joey | Abbreviation of Joseph.
| Male | |
| Joey | Abbreviation of Joseph.
| Male | |
| Kat | pure | Female | English |
| Kelly | Lively: aggressive.
| Female | Irish |
| Kimba | English place-name | Female | English |
| Kingston | From the king's village or estate King's field. King is one of several titles occasionally used as given names.
| Male | English |
| Kit | Nickname for Christopher. Frontiersman Kit Carson.
| Male | English |
| Kitkat | | Unisex | Hebrew |
| Kitty | Variant of Katherine. Pure.
| Female | English |
| Kitty | Variant of Katherine. Pure.
| Female | English |
| Kitty | Variant of Katherine. Pure.
| Female | English |
| Kiwi | | Unisex | Hebrew |
| Koko | stork | Female | Japanese |