| Name | Meaning | Gender | Origin |
|---|
| Jarvis | driver, a conqueror | Male | English |
| Jason | the Lord is salvation | Male | Hebrew |
| Jelly | | Unisex | Hebrew |
| Jerold | Variant of Gerald Rules by the spear.
| Male | |
| Jerrie | Holy Spear Warrior | Unisex | English |
| Jerrold | Variant of Gerald Rules by the spear.
| Male | |
| Jerry | after Jerry Garcia, The Grateful Dead | Male | English |
| Jesse | wealthy | Male | Hebrew |
| Kai | Fire
| Male | Hawaiian |
| Lance | knight's attendant; land | Male | English |
| Lancelot | Knight of Arthur and lover of Guinevere
| Male | |
| Launcelot | Knight of Arthur and lover of Guinevere
| Male | |
| Lennon | small cloak or cape | Male | Irish |
| Lewis | Renowned fighter. Form of Louis.
| Male | English |
| Liam | Form of William.
| Male | Irish |
| Lightning | | Unisex | Hebrew |
| Magnum | A large type of wine bottle. | Unisex | |
| Major | Army or Air Force rank above Captain but below Lieutenant Colonel | Male | Latin |
| Mao | Egyptian for Cat | Male | |
| Mason | Worker in stone. | Male | English |
| Mauser | | Unisex | |
| Max | Large spring | Male | English |
| Max | Large spring | Male | English |
| Mimmi | | Unisex | Hebrew |
| Mine | a resolute protector | Unisex | |