| Name | Meaning | Gender | Origin |
|---|
| Igor | Scottish variation of Welsh Ifor, lord or English form of Scandinavian Ifar, yew | Male | Russian |
| Inga | guarded by Ing | Female | Norse |
| Isis | throne | Female | Egyptian |
| Itty | | Unisex | Hebrew |
| Ivan | Form of John | Male | Russian |
| Jack | after the Georgetown University mascot, Jack the Bulldog | Male | English |
| Jack | From John - God's gracious gift | Male | English |
| Jackson | Son of Jack | Male | English |
| Jagger | a teamster | Male | English |
| Jake | From Jacob - To fill the place of another | Male | Hebrew |
| James | From Jacob - To fill the place of another, supplanter. | Male | English |
| James Brown | | Unisex | Hebrew |
| Jane | gracious, merciful, God is gracious | Female | English |
| Jarvis | driver, a conqueror | Male | English |
| Jason | the Lord is salvation | Male | Hebrew |
| Jasper | Black stone
| Male | Persian |
| Jasper | Black stone
| Male | Persian |
| Jasper | Black stone
| Male | Persian |
| Jat | | Unisex | Hebrew |
| Jellicle | | Unisex | Hebrew |
| Jellylorum | | Unisex | Hebrew |
| Jemima | dove | Female | Hebrew |
| Jenny | Diminutive of Jane and Jennifer.
| Female | English |
| Jenny | Diminutive of Jane and Jennifer.
| Female | English |
| Jeoffry | | Unisex | Hebrew |