| Name | Meaning | Gender | Origin |
|---|
| Major | Greater | Male | Latin |
| Manny | God is with us | Male | Hebrew |
| Marge | Pearl | Female | Greek |
| Mark | From the god Mars | Male | Latin |
| Marlene | Of Magdala | Female | Hebrew |
| Marley | Pleasant wood | Female | English |
| Marlo | Drained lake | Female | English |
| Mary | Bitter | Female | Hebrew |
| Matrix | | Unisex | Hebrew |
| Mavis | Song thrush | Male | English |
| Max | Little Maximus | Male | Latin |
| Maximus | The greatest | Male | Latin |
| May | The fifth month of the year | Female | English |
| Maya | Uncertain, perhaps mother or great one | Female | Greek |
| Mayhem | | Unisex | Hebrew |
| Meadow | A meadow | Female | English |
| Meg | Pearl | Female | Greek |
| Melvin | Uncertain, possibly bad town | Male | English |
| Mia | Uncertain, maybe bitter | Female | Hebrew |
| Mickey | Who is like God? | Unisex | Hebrew |
| Micro | | Unisex | Hebrew |
| Midnight | Intense darkness, the middle of the night | Unisex | English |
| Milo | Uncertain, perhaps peaceful | Male | Germanic |
| Minnie | Will, desire + helmet, protection | Female | Germanic |
| Missy | Bee | Female | Greek |
| Misty | Misty | Female | English |
| Moet | Brand of French Champagne | Unisex | English |
| Molly | Uncertain, maybe bitter | Female | Hebrew |
| Monty | Gomeric's hill | Male | French |
| Moose | Largest member of the deer family. Moose have heavy brown bodies with humped shoulders and broad antlers. | Unisex | English |