| Name | Meaning | Gender | Origin |
|---|
| Isabel | concecrated to God | Female | Spanish |
| Isabella | pledged to God | Female | Spanish |
| Isabelle | pledged to God | Female | |
| Isaiah | salvation of the Lord | Male | Hebrew |
| Isis | throne | Female | Egyptian |
| Ismael | Hebrew, God will hearken; Arabic, outcast | Male | Spanish |
| Issac | laughter | Male | Hebrew |
| Ivan | Form of John | Male | Russian |
| Ivy | ivy plant, a wine | Female | Plant |
| Izabella | Spanish and Italian variation of Elizabeth, Hebrew, pledged to God | Female | English |
| Izabelle | Beautiful
| Female | |
| 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 |
| Jacob | The supplanter, held by the heel | Male | Hebrew |
| Jacqueline | Feminine form of Jacques
| Female | |
| Jada | wise | Female | Spanish |
| Jade | Jewel. Courageous and adoring.
| Female | Spanish |
| Jagger | a teamster | Male | English |
| Jairo | Variant of the Hebrew Jairus Jehovah enlightens.
| Male | |
| Jake | From Jacob - To fill the place of another | Male | Hebrew |
| Jakob | Supplanter, Representative | Unisex | German |
| Jamal | beauty | Male | Arabic |
| James | From Jacob - To fill the place of another, supplanter. | Male | English |