| MacKenzie | - | Irish Name | Macy | - | English Name |
| Maddy | - | English Name | Madison | - | English Name |
| Mahuizoh | - | Nahuatl Name | Maimun | - | Algerian Name |
| Makenzie | - | Scottish Name | Mallory | - | French Name |
| Mames | - | Chamoru Name | Manauia | - | Nahuatl Name |
| Mandy | - | Latin Name | Marise | - | Japanese Name |
| Marley | - | English Name | Martie | - | Latin Name |
| Mason | - | French Name | Matsushita | - | Japanese Name |
| Maurice of Nassau | - | Dutch Name | Maverick | - | American Name |
| McKenna | - | Gaelic Name | Mckinley | - | Irish Name |
| Mecatl | - | Nahuatl Name | Meredith | - | Welsh Name |
| Meztli | - | Nahuatl Name | Michael | - | Hebrew Name |
| Micheal | - | American Name | Mickey | - | American Name |
| Ming Yue | - | Chinese Name | Minor | - | American Name |
| Miracle | - | American Name | Mo | - | American Name |
| Momoztli | - | Nahuatl Name | Mona | - | American Name |
| Montana | - | Spanish Name | Montreal | - | French Name |
| Moon | - | American Name | Moon-Unit | - | American Name |
| Moral | - | American Name | Morey | - | American Name |
| Morgan | - | Welsh Name |
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