| Name | Meaning | Gender | Origin |
|---|
| Meryl | Bright as the sea | Unisex | Gaelic |
| Meryle | Falcon | Unisex | French |
| Mia | Uncertain, maybe bitter | Female | Hebrew |
| Mimi | Uncertain, maybe bitter | Female | Hebrew |
| Mindel | Bitter Sea | Female | Jewish |
| Mirella | Uncertain, possibly admire | Female | French |
| Miriam | Uncertain, maybe bitter | Female | Hebrew |
| Mississippi | | Unisex | Hebrew |
| Mistie | Misty. | Unisex | English |
| Misty | Misty | Female | English |
| Misu | Rippling waters | Unisex | Native American |
| Mitzi | Uncertain, maybe bitter | Unisex | Hebrew |
| Miyuki | Silent snow | Unisex | Japanese |
| Moana | The sea | Female | Pacific Islander |
| Moesha | Drawn out of the water | Female | Hebrew |
| Moira | Uncertain, maybe bitter | Female | Hebrew |
| Moon | Letters | Female | Korean |
| Morgan | Uncertain, perhaps bright sea | Female | Welsh |
| Morgana | Uncertain, perhaps bright sea | Female | Welsh |
| Morgance | Dweller Of The Sea | Female | English |
| Morgandy | Little One From The Edge Of The Sea | Female | Celtic |
| Morgen | Sea-born | Female | Welsh |
| Morwen | Maid | Female | Welsh |
| Morwenna | Maid | Female | Welsh |
| Moselle | Out of the water | Female | Hebrew |
| Muna | Hope | Female | Arabic |
| Muriel | Bright as the sea | Female | Gaelic |
| Myra | Uncertain, perhaps myrrh, unguent | Female | Latin |
| Nadia | Hope | Female | Russian |
| Naia | Flowing/Blossom | Female | English |