| Name | Meaning | Gender | Origin |
|---|
| Itsy | | Unisex | Hebrew |
| Itzy | | Unisex | Hebrew |
| Iverson | | Unisex | Hebrew |
| Ivory | The hard, smooth, yellowish-white of an elephant's tusk. | Male | Word |
| Izot | | Unisex | Hebrew |
| Izzy | Salvation By God | Male | English |
| Jabberwocky | | Unisex | Hebrew |
| Jack | From John - God's gracious gift | Male | English |
| Jack | after the Georgetown University mascot, Jack the Bulldog | Male | English |
| Jackal | | Unisex | Hebrew |
| Jackson | Son of Jack | Male | English |
| Jacques | supplanter | Male | |
| Jaeger | Hunter | Unisex | German |
| Jager | Carter | Unisex | English |
| Jaguar | Large Spotted Feline | Male | English |
| Jake | From Jacob - To fill the place of another | Male | Hebrew |
| Jamal | beauty | Male | Arabic |
| James Bond | | Unisex | Hebrew |
| Jammer | | Unisex | Hebrew |
| Jasper | Black stone
| Male | Persian |
| Jasper | Black stone
| Male | Persian |
| Jasper | Black stone
| Male | Persian |
| Jaws | Bones that form the mouth. A dangerous situation - "The Jaws of Death" | Unisex | |
| Jazz | The romantic music
| Male | Word |
| Jean | God is gracious | Male | |