| Name | Meaning | Gender | Origin |
|---|
| 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 |
| Jax | God has been gracious: has shown favor. Based on John or Jacques.
| Male | Modern |
| Jefferson | son of Jeffrey | Male | English |
| Jeremy | God will uplift, appointed by God | Male | English |
| Jerome | sacred name | Male | Greek |
| Jerry | after Jerry Garcia, The Grateful Dead | Male | English |
| Jesse | wealthy | Male | Hebrew |
| Jim | supplanter | Male | English |
| Jimmy | supplanter | Male | English |
| John | God is merciful | Male | Hebrew |
| Jonah | Dove. In the bible Jonah was on board a ship God caused to sink: sailors traditionally use the name Jonah to personify someone who brings bad luck.
| Male | Hebrew |
| Jonathan | God gives | Male | Hebrew |
| Jordy | Flow, Descend | Unisex | English |
| Julius | after Julius Caesar | Male | Latin |
| Kazooie | | Unisex | Hebrew |
| Kelvin | name of a river; from the narrow river | Male | Scottish |
| Kevin | handsome | Male | Irish |
| Kirby | church settlement | Male | Norse |
| Kyle | A place-name referring to the narrows: a wood or a church.
| Male | Scottish |
| Laser | | Male | Hebrew |
| Laszlo | after the character in the movie Real Genius | Male | Hungarian |
| Legolas | Tolkien, Lord of the Rings | Unisex | |
| Leia | Weary | Unisex | Hebrew |