| Name | Meaning | Gender | Origin |
|---|
| Jett | Jet Black Gem | Male | English |
| Jip | | Male | |
| Jitterbug | | Male | Hebrew |
| Jock | God has been gracious: has shown favor. Based on John or Jacques.
| Male | Scottish |
| Johnn | Variant of the Hebrew John Jehovah has been gracious: has shown favor.
| Male | |
| Johnnie | Modern feminine of John and Jon.
| Male | English |
| Jonas | Dove. Variant of Hebrew Jonah.
| Male | Greek |
| Joplin | the afflicted | Male | English |
| Jore | God will uplift
| Male | |
| Jorie | God will uplift
| Female | English |
| Jorim | Jehovah is exalted. An ancestor of Mary.
| Male | |
| Joshua | God is salvation
| Male | Hebrew |
| Jovan | Jove-like, majestic | Male | Slavic |
| Julian | Jove's child. Form of Julius and family clan name of several powerful Roman emperors. Biblical Roman centurion Julius saved Paul's life during a hazardous voyage
| Male | English |
| Junior | Youthful person. Used to distinguish son from father where they have the same name | Male | Latin |
| Kade | From the wetlands.
| Male | Spelling |
| Kai | Fire
| Male | Hawaiian |
| Kam | Form of Cameron crooked nose.
| Male | |
| Kanji | | Male | Hebrew |
| Karsten | Blessed or annointed one. Alternate Spelling: Carsten. Variant of Kristian.
| Male | Spelling |
| Kasey | Vigilant, Watchful | Female | English |
| Keegan | A thinker: fiery. Form of Hugh.
| Male | Irish |
| Keeki | | Male | |
| Keg | | Male | Hebrew |
| Kegan | A thinker: fiery. Form of Hugh.
| Male | |