| Name | Meaning | Gender | Origin |
|---|
| Mia | Uncertain, maybe bitter | Female | Hebrew |
| Mickey | Who is like God? | Unisex | Hebrew |
| Midnight | Intense darkness, the middle of the night | Unisex | English |
| Mikey | Who is like God? | Unisex | Hebrew |
| Milky | | Unisex | Hebrew |
| Millicent | Strong work | Female | Germanic |
| Millie | Labour | Female | Germanic |
| Mimi | Uncertain, maybe bitter | Female | Hebrew |
| Mina | Will, desire + helmet, protection | Female | Germanic |
| Mindy | Pet form of Melinda | Female | English |
| Minka | Strong, Resolute | Female | German |
| Miracle | Wonder | Unisex | English |
| Miranda | She who must be admired | Female | Latin |
| Miss | | Unisex | Hebrew |
| Mister | | Unisex | Hebrew |
| Misty | Misty | Female | English |
| Mittens | | Unisex | Hebrew |
| Mitzi | Uncertain, maybe bitter | Unisex | Hebrew |
| Mojo | Good luck charm. | Unisex | English |
| Monday | The second day of the week, following Sunday. | Unisex | English |
| Monster | A creature of frightening appearance | Unisex | English |
| Montana | Mountainous | Unisex | Latin |
| Moo | | Unisex | Hebrew |
| Moon | Letters | Female | Korean |
| Moose | Largest member of the deer family. Moose have heavy brown bodies with humped shoulders and broad antlers. | Unisex | English |
| Mouse | A small rodent with a long tail and small rounded ears. | Unisex | English |
| Mr. | | Unisex | Hebrew |
| Muffin | A small cup shaped cake | Unisex | English |
| Mutley | | Unisex | Hebrew |
| Mya | Uncertain, perhaps mother or great one | Female | Greek |