| Name | Meaning | Gender | Origin |
|---|
| Ivory | The hard, smooth, yellowish-white of an elephant's tusk. | Male | Word |
| Izzy | Salvation By God | Male | English |
| Jabba | | Unisex | Hebrew |
| Jack | From John - God's gracious gift | Male | English |
| Jack | after the Georgetown University mascot, Jack the Bulldog | Male | English |
| Jackson | Son of Jack | Male | English |
| Jada | wise | Female | Spanish |
| Jade | Jewel. Courageous and adoring.
| Female | Spanish |
| Jamie | Feminine of James | Female | Scottish |
| Jar Jar Binks | | Unisex | Hebrew |
| Jasper | Black stone
| Male | Persian |
| Jasper | Black stone
| Male | Persian |
| Jasper | Black stone
| Male | Persian |
| Java Bean | | Unisex | Hebrew |
| Jazz | The romantic music
| Male | Word |
| Jelly | | Unisex | Hebrew |
| Jet | A deep black colour. Aircraft engine that propels an aircraft forward by expelling exhaust gases toward the rear. | Male | Mineral |
| Jet Black | | Unisex | |
| Jewel | Jewel
| Female | Word |
| Jezebel | follower of idols | Female | Hebrew |
| Jimmy | supplanter | Male | English |
| Jinx | Charm, Spell | Female | Latin |
| Job | The Persecuted | Male | Hebrew |
| John | God is merciful | Male | Hebrew |
| Jones | God Will Bring | Male | Welsh |