| Name | Meaning | Gender | Origin |
|---|
| Igloo | Dome shaped Eskimo house made of blocks of snow. | Unisex | |
| Image | | Unisex | Hebrew |
| Iris | rainbow, a play of colours | Female | |
| Isabella | pledged to God | Female | Spanish |
| Isis | throne | Female | Egyptian |
| Ivy | ivy plant, a wine | Female | Plant |
| Izzy | Salvation By God | Male | English |
| Jace | Hebrew, the Lord is salvation | Male | Hebrew |
| 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 |
| Jade | Jewel. Courageous and adoring.
| Female | Spanish |
| Jafar | little stream | Unisex | |
| Jake | From Jacob - To fill the place of another | Male | Hebrew |
| James | From Jacob - To fill the place of another, supplanter. | Male | English |
| Jane | gracious, merciful, God is gracious | Female | English |
| Jasmine | Flower
| Female | Persian |
| Jason | the Lord is salvation | Male | Hebrew |
| Jasper | Black stone
| Male | Persian |
| Jasper | Black stone
| Male | Persian |
| Jasper | Black stone
| Male | Persian |
| Java | Brewed coffee | Female | Anglicization |
| Jeff | pledge of peace | Male | English |
| Jemma | Italian, precious stone | Female | Spelling |
| Jenny | Diminutive of Jane and Jennifer.
| Female | English |