| Name | Meaning | Gender | Origin |
|---|
| Jacob | Supplanter | Male | Hebrew |
| Jake | Supplanted | Male | Hebrew |
| Jasper | Treasurer | Male | Persian |
| Jay | Jay bird | Male | English |
| Jazz | The romantic music | Unisex | English |
| Jerry | Spear ruler | Male | Germanic |
| Jett | Black gemstone | Male | English |
| Jojo | Monday born | Unisex | African |
| Junior | Younger | Male | English |
| Justice | Righteous | Unisex | Latin |
| Kay | Pure | Male | Greek |
| Kermit | Son of the one without envy | Male | Gaelic |
| King | King's forest clearing | Male | English |
| Lady | Lady | Unisex | English |
| Levi | Combined | Male | Hebrew |
| Louie | Fame and war | Male | Germanic |
| Louis | Fame and war | Male | Germanic |
| Lucky | Fortunate | Unisex | English |
| Magic | Possessing qualities that produce baffling effects | Unisex | English |
| Malcolm | Columba's servant | Male | Gaelic |
| Marvin | Uncertain, possibly eminent marrow | Male | Welsh |
| Matt | Gift of God | Male | Hebrew |
| Max | Little Maximus | Male | Latin |
| Mickey | Who is like God? | Unisex | Hebrew |
| Midnight | Intense darkness, the middle of the night | Unisex | English |
| Mister | | Unisex | Hebrew |
| Mojo | Good luck charm. | Unisex | English |
| Montana | Mountainous | Unisex | Latin |
| Monty | Gomeric's hill | Male | French |
| Munchkin | A very small elflike person. | Unisex | English |