| Name | Meaning | Gender | Origin |
|---|
| Mini | Something smaller than others of its type | Unisex | English |
| Mischief | One that causes minor trouble or disturbances | Unisex | English |
| Mister | | Unisex | Hebrew |
| Mittens | | Unisex | Hebrew |
| Mitzi | Uncertain, maybe bitter | Unisex | Hebrew |
| Mitzy | | Unisex | Hebrew |
| Mo | Moor | Unisex | Latin |
| Mocha | Coffee of high quality. | Unisex | English |
| Mojo | Good luck charm. | Unisex | English |
| Monster | A creature of frightening appearance | Unisex | English |
| Montana | Mountainous | Unisex | Latin |
| Moose | Largest member of the deer family. Moose have heavy brown bodies with humped shoulders and broad antlers. | Unisex | English |
| Mouse | A small rodent with a long tail and small rounded ears. | Unisex | English |
| Muffin | A small cup shaped cake | Unisex | English |
| Muffy | | Unisex | Hebrew |
| Munchkin | A very small elflike person. | Unisex | English |
| Nana | Grace | Unisex | Hebrew |
| Newt | New settlement, new enclosure | Unisex | English |
| Nibbles | | Unisex | Hebrew |
| Nicky | Victory of the people | Unisex | Greek |
| Nugget | As in Chicken | Unisex | English |
| Nutmeg | | Unisex | Hebrew |
| Obie | O.B. | Unisex | English |
| Odie | Woad hill | Unisex | English |
| Onyx | A gemstone with bands of different colours. | Unisex | English |
| Oreo | American cookie brand consisting of two chocolate wafers with white cream filling. | Unisex | English |
| Panda | A bear like Chinese mammal, with distinct black and white markings | Unisex | English |
| Panther | A black leopard | Unisex | English |
| Pasha | Passover | Unisex | Greek |
| Patches | | Unisex | Hebrew |