| Name | Meaning | Gender | Origin |
|---|
| Mittens | | Unisex | |
| Mollie | Bitter | Unisex | English |
| Mopsy | Term of affection, a darling. | Unisex | |
| Mouse | A small rodent with a long tail and small rounded ears. | Unisex | |
| Muffin | A small cup shaped cake | Unisex | |
| Munchkin | A very small elflike person. | Unisex | |
| Murphy | Sea warrior | Male | Irish |
| Nermal | | Unisex | |
| Noodles | | Male | |
| Nugget | as in Chicken | Unisex | |
| Nutmeg | | Male | |
| Oliver | The olive tree. The biblical olive tree symbolizes fruitfulness and beauty and dignity. Extending an olive branch signifies an offer of peace.
| Male | Latin |
| Oreo | American cookie brand consisting of two chocolate wafers with white cream filling. | Male | |
| Oreo | American cookie brand consisting of two chocolate wafers with white cream filling. | Male | |
| Oscar | God's spear.
| Male | English |
| Panda | A bear like Chinese mammal, with distinct black and white markings | Male | |
| Papoose | | Unisex | Hebrew |
| Patches | | Male | |
| Peach | | Unisex | |
| Peanut | Edible nuts eaten raw or roasted. | Unisex | |
| Peanut Butter | | Unisex | |
| Pebbles | after the character in 'The Flintstones' cartoons | Male | |
| Pee Wee | | Unisex | |
| Pepper | A spice or condiment. | Male | Sanskrit |
| Petros | Rock | Unisex | Greek |