| Name | Meaning | Gender | Origin |
|---|
| Midnight | Intense darkness, the middle of the night | Male | English |
| Millie | English, gentle strength | Female | English |
| Milo | Merciful.
| Male | Latinized |
| Milo | Merciful.
| Male | Latinized |
| Mimi | Form of Williamina
| Female | English |
| Mimi | Form of Williamina
| Female | English |
| Minette | Form of Williamina
| Female | |
| Minka | Strong | Male | German |
| Minnie | Form of Williamina
| Female | English |
| Minou | | Unisex | |
| Miss Kitty | | Unisex | |
| Missy | Informal term for young woman | Female | English |
| Misty | misty.
| Female | English |
| Misty | misty.
| Female | English |
| Mittens | | Unisex | |
| Molly | Bitter
| Female | English |
| Moritz | Dark Skinned | Unisex | German |
| Muffin | A small cup shaped cake | Unisex | |
| Murphy | Sea warrior | Male | Irish |
| Nala | African for love, after the character in the Lion King movies | Female | African |
| Noodle | A narrow ribbon-like strip of dough | Unisex | |
| 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 |