| Name | Meaning | Gender | Origin |
|---|
| Molly | Bitter
| Female | English |
| Monroe | mouth of the Roe River; wheelwright | Female | Scottish |
| Monroe | mouth of the Roe River; wheelwright | Female | Scottish |
| Moon Unit | | Unisex | Hebrew |
| Moonshine | Moonlight or illegally distilled whiskey. | Unisex | |
| Moose | Largest member of the deer family. Moose have heavy brown bodies with humped shoulders and broad antlers. | Unisex | |
| Morgan | circle; sea | Female | Welsh |
| Morning Glory | | Unisex | Hebrew |
| Muffin | A small cup shaped cake | Unisex | |
| Mustard | Seeds ground into paste and used as a spicy condiment | Unisex | |
| Nellie | the bright one | Female | English |
| Nilla | glorious | Female | African |
| Nola | Noble or Famous | Female | Gaelic |
| Noodle | A narrow ribbon-like strip of dough | Unisex | |
| Nora | Abbreviation of Eleanora light and Honora honor.
| Female | Irish |
| Nougat | | Unisex | |
| Nugget | as in Chicken | Unisex | |
| Okra | | Unisex | Hebrew |
| Old Yeller | | Unisex | Hebrew |
| Oleander | | Unisex | |
| Oleo | | Unisex | Hebrew |
| Opal | Australian gemstone of remarkable colours, usually red, blue or green | Female | Sanskrit |
| Opal | Australian gemstone of remarkable colours, usually red, blue or green | Female | Sanskrit |
| Opie | | Unisex | |
| Orange | Round citrus fruit originating in Southeast Asia. | Female | Fruit |