| Name | Meaning | Gender | Origin |
|---|
| Marble | | Unisex | Hebrew |
| Marley | Pleasant wood | Female | English |
| Mary | Bitter | Female | Hebrew |
| Mattie | Powerful battler | Female | German |
| Maverick | Dissenter | Unisex | English |
| Maxine | Little Maximus | Female | Latin |
| May | The fifth month of the year | Female | English |
| Maya | Uncertain, perhaps mother or great one | Female | Greek |
| Mckenzie | Son of Coinneach | Female | Gaelic |
| Meadow | A meadow | Female | English |
| Megan | Pearl | Female | Greek |
| Mercedes | Mercies | Female | Spanish |
| 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 |
| Millie | Labour | Female | Germanic |
| Mimi | Uncertain, maybe bitter | Female | Hebrew |
| Mindy | Pet form of Melinda | Female | English |
| Mini | Something smaller than others of its type | Unisex | English |
| Minnie | Will, desire + helmet, protection | Female | Germanic |
| Mischief | One that causes minor trouble or disturbances | Unisex | English |
| Missy | Bee | Female | Greek |
| Mister | | Unisex | Hebrew |
| Misty | Misty | Female | English |
| Mittens | | Unisex | Hebrew |
| Mitzi | Uncertain, maybe bitter | Unisex | Hebrew |
| Mitzy | | Unisex | Hebrew |
| Mo | Moor | Unisex | Latin |
| Mocha | Coffee of high quality. | Unisex | English |