| Name | Meaning | Gender | Origin |
|---|
| Martin | From the god Mars | Male | Latin |
| Marvin | Uncertain, possibly eminent marrow | Male | Welsh |
| Massimo | The greatest | Male | Latin |
| Mathew | Gift of God | Male | Hebrew |
| Matt | Gift of God | Male | Hebrew |
| Mauricio | Moor | Male | Latin |
| Maverick | Dissenter | Unisex | English |
| Max | Little Maximus | Male | Latin |
| Maxi | Pet form of names starting with Max | Unisex | English |
| Maximilian | Little Maximus | Male | Latin |
| Maximus | The greatest | Male | Latin |
| Maxwell | Maccus's stream | Male | English |
| Mayes | Soft section | Unisex | Arabic |
| Mel | Uncertain, possibly bad town | Unisex | English |
| Melvin | Uncertain, possibly bad town | Male | English |
| Merlin | Sea fort | Male | Welsh |
| Mervyn | Uncertain, possibly eminent marrow | Male | Welsh |
| Meyer | He who illuminates | Male | Hebrew |
| Michel | Who is like God? | Male | Hebrew |
| Mick | Who is like God? | Male | Hebrew |
| Mickey | Who is like God? | Unisex | Hebrew |
| Mikhail | Who resembles God? | Male | Hebrew |
| Millard | Guardian of the mill | Male | English |
| Miroslav | Praise | Male | Czech |
| Mo | Moor | Unisex | Latin |
| Moises | Drawn from the water | Male | Hebrew |
| Montana | Mountainous | Unisex | Latin |
| Moss | Drawn out of the water | Male | Hebrew |
| Neil | Champion | Male | Gaelic |
| Nelson | Son of Neal | Male | English |