| Name | Meaning | Gender | Origin |
|---|
| Max | Little Maximus | Male | Latin |
| Maxi | Pet form of names starting with Max | Unisex | English |
| Maximillion | | Unisex | Hebrew |
| Maximus | The greatest | Male | Latin |
| Maxwell | Maccus's stream | Male | English |
| Maxx | Greatest | Unisex | English |
| Meka | Eyes | Male | English |
| Mickey | Who is like God? | Unisex | Hebrew |
| Midnight | Intense darkness, the middle of the night | Unisex | English |
| Mighty | | Unisex | Hebrew |
| Miles | Uncertain, perhaps peaceful | Male | Germanic |
| Milo | Uncertain, perhaps peaceful | Male | Germanic |
| Mini | Something smaller than others of its type | Unisex | English |
| Mitzi | Uncertain, maybe bitter | Unisex | Hebrew |
| Mocha | Coffee of high quality. | Unisex | English |
| Monroe | Mouth of the River Roe | Male | Gaelic |
| Moondust | | Unisex | Hebrew |
| Moose | Largest member of the deer family. Moose have heavy brown bodies with humped shoulders and broad antlers. | Unisex | English |
| Moses | Drawn out of the water | Male | Hebrew |
| Moxie | Ability to face difficulty with courage. | Unisex | English |
| Mozart | | Unisex | Hebrew |
| Mufasa | From The Lion King | Unisex | English |
| Muffin | A small cup shaped cake | Unisex | English |
| Muffy | | Unisex | Hebrew |
| Munchkin | A very small elflike person. | Unisex | English |
| Murphy | Sea warrior | Male | Gaelic |
| Mystic | | Unisex | Hebrew |
| Nemo | No one | Male | Latin |
| Neptune | God of the sea | Unisex | Latin |
| Neutron | | Unisex | Hebrew |