| Name | Meaning | Gender | Origin |
|---|
| Ivan | Form of John | Male | Russian |
| Ivory | The hard, smooth, yellowish-white of an elephant's tusk. | Male | Word |
| Jack | after the Georgetown University mascot, Jack the Bulldog | Male | English |
| Jack | From John - God's gracious gift | Male | English |
| Jackie | supplanter | Female | English |
| Jade | Jewel. Courageous and adoring.
| Female | Spanish |
| Jaguar | Large Spotted Feline | Male | English |
| Jake | From Jacob - To fill the place of another | Male | Hebrew |
| Jamaica | Isle with many springs | Female | Place-name |
| James | From Jacob - To fill the place of another, supplanter. | Male | English |
| Janie | Jehovah Has Been Gracious; Has Shown Favor. Variant Of Joan. | Unisex | English |
| Jasmine | Flower
| Female | Persian |
| Jasper | Black stone
| Male | Persian |
| Jasper | Black stone
| Male | Persian |
| Jasper | Black stone
| Male | Persian |
| Jay | jaybird | Male | Latin |
| Jazz | The romantic music
| Male | Word |
| Jazzy | Modern variant of Jasmine: combination of Jocelyn and the musical term jazz.
| Female | |
| Jean | God is gracious | Male | |
| Jello | | Unisex | Hebrew |
| Jelly-Belly | | Unisex | Hebrew |
| Jenga | | Unisex | Hebrew |
| Jenny | Diminutive of Jane and Jennifer.
| Female | English |
| Jenny | Diminutive of Jane and Jennifer.
| Female | English |
| Jerry | after Jerry Garcia, The Grateful Dead | Male | English |