| Name | Meaning | Gender | Origin |
|---|
| Jen | White, Fair | Unisex | English |
| 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 |
| Jett | Jet Black Gem | Male | English |
| Jill | youthful | Female | English |
| Jim | supplanter | Male | English |
| Jinx | Charm, Spell | Female | Latin |
| Jip | | Male | |
| Jo | Variation of Johanna, God is gracious | Female | English |
| Job | The Persecuted | Male | Hebrew |
| Jock | God has been gracious: has shown favor. Based on John or Jacques.
| Male | Scottish |
| Joe | Abbreviation of Joseph.
| Male | English |
| Joe | Abbreviation of Joseph.
| Male | English |
| John | God is merciful | Male | Hebrew |
| Jon | God is gracious; or gift of Jehovah | Male | English |
| Josh | God Saves | Unisex | English |
| Joy | From Joyce - Gay and joyful | Female | Word |
| Joyce | after James Augustine Aloysius Joyce, Irish writer and poet | Female | Latin |
| Judd | praised | Male | Medieval |
| Judge | One who hears and decides Court cases. | Male | Word |
| Juice | | Unisex | Hebrew |
| Jules | youthful; soft, downy | Male | |
| June | 6Th Month | Female | English |
| Kai | Fire
| Male | Hawaiian |
| Kane | tribute, warrior; the doubly-accomplished, golden; man, the eastern sky; beautiful | Male | Celtic |