| Name | Meaning | Gender | Origin |
|---|
| Inga | guarded by Ing | Female | Norse |
| Isaac | laughing one | Male | 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 |
| Jade | Jewel. Courageous and adoring.
| Female | Spanish |
| Jagger | a teamster | Male | English |
| Jake | From Jacob - To fill the place of another | Male | Hebrew |
| Java | Brewed coffee | Female | Anglicization |
| Jenna | white shadow, white wave | Female | English |
| Jesse | wealthy | Male | Hebrew |
| Jester | A fool at medieval courts | Unisex | |
| Jett | Jet Black Gem | Male | English |
| Jinx | Charm, Spell | Female | Latin |
| Joseph | God will increase | Male | Hebrew |
| Kahlua | | Unisex | |
| Kami | Loving | Unisex | Hindu |
| Kasper | treasurer | Male | Persian |
| Katie | Variant of Katherine. Pure.
| Female | English |
| Kato | second of twins | Male | African |
| Keanu | cool breeze over the mountains | Male | Hawaiian |
| Keiko | Japanese for happy or beloved | Female | Japanese |
| Keira | after the actress Keira Knightley | Female | Irish |
| Kenya | Animal Horn | Female | Hebrew |
| Kevin | handsome | Male | Irish |