| Name | Meaning | Gender | Origin |
|---|
| Malcolm | Columba's servant | Male | Gaelic |
| Maverick | Dissenter | Unisex | English |
| Max | Little Maximus | Male | Latin |
| Merrick | Moor | Male | Welsh |
| Mickey | Who is like God? | Unisex | Hebrew |
| Midnight | Intense darkness, the middle of the night | Unisex | English |
| Mikey | Who is like God? | Unisex | Hebrew |
| Mitzi | Uncertain, maybe bitter | Unisex | Hebrew |
| Monroe | Mouth of the River Roe | Male | Gaelic |
| Monte | Gomeric's hill | Male | French |
| Montgomery | Gomeric's hill | Male | French |
| Monty | Gomeric's hill | Male | French |
| Moxie | Ability to face difficulty with courage. | Unisex | English |
| Murphy | Sea warrior | Male | Gaelic |
| Murray | Man of the sea | Male | Gaelic |
| Myles | Uncertain, perhaps peaceful | Male | Germanic |
| Newman | New man | Male | English |
| Newton | New settlement, new enclosure | Male | English |
| Nick | Victory of the people | Male | Greek |
| Oakley | From the oak meadow | Male | English |
| Oberon | Noble bear | Unisex | German |
| Oliver | Elf army | Male | French |
| Ollie | Elf army | Male | French |
| Oreo | American cookie brand consisting of two chocolate wafers with white cream filling. | Unisex | English |
| Orion | Son Of Fire | Male | Greek |
| Oscar | Divine spear | Male | English |
| Oz | Divine | Male | English |
| Paddy | Patrician | Male | Latin |
| Parker | Gamekeeper of a park | Male | English |
| Patches | | Unisex | Hebrew |