| Name | Meaning | Gender | Origin |
|---|
| Javiero | Born in January
| Male | |
| Jayson | Healer. Alternate spelling of Jason.
| Male | |
| Jazzpurr | | Unisex | Hebrew |
| Jazzy | Modern variant of Jasmine: combination of Jocelyn and the musical term jazz.
| Female | |
| Jeraldo | Variant of Gerald Rules by the spear.
| Male | |
| Jerardo | Variant of Gerard Rules by the spear.
| Male | |
| Jeronimo | Spanish form of Jerome saved
| Male | |
| Jesse James | | Unisex | Hebrew |
| Jewel | Jewel
| Female | Word |
| Jingo | | Male | |
| Jinx | Charm, Spell | Female | Latin |
| Joanna | after the character in The Rescuers Down Under cartoon | Female | English |
| Joelle | Jehovah is God
| Female | |
| Joely | French, pretty | Female | Feminine |
| Jorie | God will uplift
| Female | English |
| Junky | Messy, related to junk. Meaningless junk. | Male | |
| Kafir | | Male | Hebrew |
| Kamden | Winding Valley. Form of Camden.
| Male | Spelling |
| Kanga | | Male | Hebrew |
| Kanji | | Male | Hebrew |
| Karma | Fate or destiny (Hinduism and Buddhism) | Female | Hindi |
| Karsten | Blessed or annointed one. Alternate Spelling: Carsten. Variant of Kristian.
| Male | Spelling |
| Kayleigh | Slender | Unisex | English |
| Keegan | A thinker: fiery. Form of Hugh.
| Male | Irish |
| Keeki | | Male | |