| Name | Meaning | Gender | Origin |
|---|
| 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 |
| James | From Jacob - To fill the place of another, supplanter. | Male | English |
| Jay | jaybird | Male | Latin |
| Jefferson | son of Jeffrey | Male | English |
| Jeremiah | Exalted of the Lord
| Male | Hebrew |
| Jonathan | God gives | Male | Hebrew |
| Jones | God Will Bring | Male | Welsh |
| Josefina | God Will Increase | Unisex | Spanish |
| Joseph | God will increase | Male | Hebrew |
| Julep | Rosewater | Unisex | Persian |
| Jules | youthful; soft, downy | Male | |
| Julius | after Julius Caesar | Male | Latin |
| Kipling | after Rudyard Kipling, writer | Unisex | |
| Lawson | son of Lawrence | Male | English |
| Leander | lion man | Male | Greek |
| Lionel | Cousin of Lancelot
| Male | Latin |
| Livingston | dear friend's place | Male | English |
| Magnus | One who is great.
| Male | Latin |
| Malcolm | Royal Blood | Male | Scottish |
| Marcus | warlike | Male | Latin |
| Marshall | Man who looks after a nobleman's estate, keeper of the horses; steward | Male | |
| Matthew | Gift of the Lord | Male | Hebrew |