| Name | Meaning | Gender | Origin |
|---|
| Lewis | Renowned fighter. Form of Louis.
| Male | English |
| Lima | Mythical Goddess Of The Threshold | Unisex | Latin |
| Lincoln | Capital of Nebraska, USA. Old English: home by the pond | Male | English |
| Lisbon | | Unisex | Hebrew |
| Livingston | dear friend's place | Male | English |
| Lloyd | gray | Male | Welsh |
| Locke | after the philosopher John Locke | Male | English |
| Lynn | A cascade
| Male | Welsh |
| Manhasset | after a music stand company | Unisex | |
| Manhattan | Whiskey | Unisex | |
| Mansfield | From The Field By The Small River | Unisex | English |
| Marathon | | Male | Hebrew |
| Marion | bitter | Male | |
| Marlboro | | Unisex | Hebrew |
| Marshall | Man who looks after a nobleman's estate, keeper of the horses; steward | Male | |
| Maximus | greatest | Male | Latin |
| Melville | hillside; town by the mill | Male | Scottish |
| Merrick | ruler of the sea | Male | Anglo-Welsh |
| Milo | Merciful.
| Male | Latinized |
| Milo | Merciful.
| Male | Latinized |
| Milton | from the mill town | Male | English |
| Mohawk | Native American Tribe Name | Unisex | Native American |
| Montague | steep mountain | Male | |
| Montezuma | after the Aztec god-king | Unisex | |
| Montgomery | mountain hunter | Male | |