| Name | Meaning | Gender | Origin |
|---|
| Mitsy | | Unisex | Hebrew |
| Mittens | | Unisex | |
| Mocha | Coffee of high quality. | Female | Arabic |
| Molly | Bitter
| Female | English |
| Moon | Moon | Female | American |
| 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 | |
| Myrtle | a flower, symbol of victory | Female | Greek |
| Nadia | hope | Female | Russian |
| Nala | African for love, after the character in the Lion King movies | Female | African |
| Natalie | birthday of the Lord | Female | |
| Nellie | the bright one | Female | English |
| Nermal | | Unisex | |
| Nessie | From Agnes - Pure and chaste. | Female | |
| Nibbles | | Unisex | |
| Norma | the pattern | Female | English |
| Nugget | as in Chicken | Unisex | |
| Octavia | eighth | Female | Latin |
| Olive | kind one; olive tree, peace. Symbol of peace. A small oval fruit. | Female | English |
| Olivia | Olive
| Female | Latin |
| Olympia | of Mount Olympus, heavenly | Female | Greek |
| 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 |