| Name | Meaning | Gender | Origin |
|---|
| Morgan | Uncertain, perhaps bright sea | Female | Welsh |
| Morwenna | Maid | Female | Welsh |
| Moselle | Out of the water | Female | Hebrew |
| Mouse | A small rodent with a long tail and small rounded ears. | Unisex | English |
| Mya | Uncertain, perhaps mother or great one | Female | Greek |
| Nana | Grace | Unisex | Hebrew |
| Neely | Feminine Of Neil Champion. | Unisex | English |
| Nelia | Horn | Female | Latin |
| Nerissa | Sea sprite | Female | Greek |
| Nilima | | Female | Hebrew |
| Nola | Fair shoulder, white shoulder | Female | Gaelic |
| Nuala | Fair shoulder, white shoulder | Female | Gaelic |
| Nugget | As in Chicken | Unisex | English |
| Nutmeg | | Unisex | Hebrew |
| Odele | Harmonious | Female | English |
| Odette | Wealth | Female | Germanic |
| Oliana | Oleander | Female | English |
| Olive | Olive | Female | English |
| Olivia | Elf army | Female | English |
| Olwen | White footprint | Female | Welsh |
| Onyx | A gemstone with bands of different colours. | Unisex | English |
| Opal | Jewel, gem | Female | Sanskrit |
| Ophira | Gold | Female | Hebrew |
| Ora | Light | Female | Hebrew |
| Orange | Orange | Unisex | English |
| Oreo | American cookie brand consisting of two chocolate wafers with white cream filling. | Unisex | English |
| Orinda | Pine tree | Female | Hebrew |
| Oriole | Golden | Female | Latin |
| Ormond | Bears mountain | Unisex | English |
| Pahana | Anglo | Unisex | Native American |