| Name | Meaning | Gender | Origin |
|---|
| Mervyn | Uncertain, possibly eminent marrow | Male | Welsh |
| Meryl | Bright as the sea | Unisex | Gaelic |
| Meryle | Falcon | Unisex | French |
| Mia | Uncertain, maybe bitter | Female | Hebrew |
| Millard | Guardian of the mill | Male | English |
| Miller | Grinder of grain | Male | English |
| 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 |
| Moe | Moor | Male | Latin |
| Moesha | Drawn out of the water | Female | Hebrew |
| Moira | Uncertain, maybe bitter | Female | Hebrew |
| Moises | Drawn from the water | Male | Hebrew |
| Monroe | Mouth of the River Roe | Male | Gaelic |
| 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 |
| Moriarty | Expert Seaman | Male | English |
| Mort | Moor | Male | English |