| Name | Meaning | Gender | Origin |
|---|
| Ira | watchful, descendant | Male | Hebrew |
| Iris | rainbow, a play of colours | Female | |
| Isis | throne | Female | Egyptian |
| Ivy | ivy plant, a wine | Female | Plant |
| 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 |
| Jade | Jewel. Courageous and adoring.
| Female | Spanish |
| Jake | From Jacob - To fill the place of another | Male | Hebrew |
| James | From Jacob - To fill the place of another, supplanter. | Male | English |
| Jana | Feminine variation of John | Female | Czech |
| Jane | gracious, merciful, God is gracious | Female | English |
| Jasmine | Flower
| Female | Persian |
| Jason | the Lord is salvation | Male | Hebrew |
| Jax | God has been gracious: has shown favor. Based on John or Jacques.
| Male | Modern |
| Jay | jaybird | Male | Latin |
| Jayce | Moon | Male | English |
| Jean | God is gracious | Male | |
| Jenna | white shadow, white wave | Female | English |
| Jett | Jet Black Gem | Male | English |
| Jill | youthful | Female | English |
| Joel | God is willing, Jehova is the Lord | Male | Hebrew |
| John | God is merciful | Male | Hebrew |
| Jolie | French for pretty | Female | |
| Josh | God Saves | Unisex | English |