| Name | Meaning | Gender | Origin |
|---|
| Irma | universal, complete | Female | |
| 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 |
| Jackie | supplanter | Female | English |
| Jacob | The supplanter, held by the heel | Male | Hebrew |
| Jacqueline | Feminine form of Jacques
| Female | |
| James | From Jacob - To fill the place of another, supplanter. | Male | English |
| Jamie | Feminine of James | Female | Scottish |
| Jane | gracious, merciful, God is gracious | Female | English |
| Janet | Variant of Jane | Female | English |
| Jason | the Lord is salvation | Male | Hebrew |
| Javier | Born in January
| Male | Spanish |
| Jay | jaybird | Male | Latin |
| Jean | God is gracious | Male | |
| Jeanette | French variation of Jean, God is gracious | Female | |
| Jeff | pledge of peace | Male | English |
| Jeffery | Peaceful. Variant of Geoffrey in use since medieval times.
| Male | |
| Jeffrey | pledge of peace | Male | Spelling |
| Jennie | English, God's gracious gift | Female | English |
| Jennifer | white shadow, white wave | Female | Cornish |
| Jenny | Diminutive of Jane and Jennifer.
| Female | English |
| Jenny | Diminutive of Jane and Jennifer.
| Female | English |
| Jeremy | God will uplift, appointed by God | Male | English |