| Name | Meaning | Gender | Origin |
|---|
| Minnie | Form of Williamina
| Female | English |
| Mirari | Miracle
| Female | |
| Mireya | Miracle
| Female | Spanish |
| Mist | | Unisex | |
| Mister | | Male | |
| Misty | misty.
| Female | English |
| Misty | misty.
| Female | English |
| Molly | Bitter
| Female | English |
| Moony | | Unisex | |
| Mork And Mindy | | Unisex | Hebrew |
| Moxie | Ability to face difficulty with courage. | Female | English |
| Mrs Black | Sirius' mum.
| Female | |
| Nacho | Small triangles of tortilla topped with cheese. | Male | Word |
| Nelson | son of a champion, son of Neil | Male | English |
| Nero | stern | Male | Latin |
| Nicky | Abbreviation of Nicholas. Mythological Nike was Greek goddess of victory and root origin of Nicholas.
| Female | |
| Noe | Comfort
| Male | |
| Noga | Sparkle
| Female | |
| Nugget | as in Chicken | Unisex | |
| Nuisance | | Male | Hebrew |
| 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 |
| Ollie | Latin, olive tree | Male | English |
| Omega | great | Male | Greek |
| Opus | | Male | Hebrew |
| Oscar | God's spear.
| Male | English |