| Name | Meaning | Gender | Origin |
|---|
| Jake | From Jacob - To fill the place of another | Male | Hebrew |
| Jamal | beauty | Male | Arabic |
| Jasmine | Flower
| Female | Persian |
| Java | Brewed coffee | Female | Anglicization |
| Java Bean | | Unisex | Hebrew |
| Jax | God has been gracious: has shown favor. Based on John or Jacques.
| Male | Modern |
| Jess | Gift | Male | English |
| Jet | A deep black colour. Aircraft engine that propels an aircraft forward by expelling exhaust gases toward the rear. | Male | Mineral |
| Jet Black | | Unisex | |
| Jett | Jet Black Gem | Male | English |
| Jetty | | Unisex | Hebrew |
| Jiji | from the animated movie Kiki's Delivery Service (Majo no Takkyuubin | Unisex | |
| Jingles | | Unisex | Hebrew |
| Jinx | Charm, Spell | Female | Latin |
| Joker | | Male | Hebrew |
| Juju | | Unisex | Hebrew |
| Juliet | youthful | Female | English |
| Kala | time, black | Unisex | |
| Kat | pure | Female | English |
| Kettle | | Unisex | |
| Kiki | From Enriqueta - Pet | Female | |
| Kiki | From Enriqueta - Pet | Female | |
| Kinky | | Unisex | |
| Kitkat | | Unisex | Hebrew |
| Kitty | Variant of Katherine. Pure.
| Female | English |