| Name | Meaning | Gender | Origin |
|---|
| Julian | Jove's child. Form of Julius and family clan name of several powerful Roman emperors. Biblical Roman centurion Julius saved Paul's life during a hazardous voyage
| Male | English |
| Julius | after Julius Caesar | Male | Latin |
| Kit | Nickname for Christopher. Frontiersman Kit Carson.
| Male | English |
| Lancelot | Knight of Arthur and lover of Guinevere
| Male | |
| Lawson | son of Lawrence | Male | English |
| Lewis | Renowned fighter. Form of Louis.
| Male | English |
| Liam | Form of William.
| Male | Irish |
| Logan | little hollow | Male | Scottish |
| Louis | famed warrior | Male | |
| Luca | man from Lucania | Male | Italian |
| Lucius | Light | Male | Roman |
| Ludo | after the character in the movie Labyrinth | Unisex | |
| Marcus | warlike | Male | Latin |
| Marmaduke | leader of the seas | Male | Irish |
| Marshall | Man who looks after a nobleman's estate, keeper of the horses; steward | Male | |
| Maurice | moorish; dark; moor land | Male | Latin |
| Max | Large spring | Male | English |
| Max | Large spring | Male | English |
| Maximilian | greatest | Male | Latin |
| Maximillian | The greatest.
| Male | |
| Maximus | greatest | Male | Latin |
| Maxwell | Capable
| Male | Scottish |
| Merlin | Character on Chocolate Frog card.
| Male | Welsh |
| Messi | | Unisex | |
| Michael | who is like God | Male | Hebrew |