- Morten
- Mortensen
- Mortimer
- Mortin
- Morton
- Morye
- Moseley
- Moser
- Moses
- Mosier
- Moss
- Mosses
- Motley
- Mouatt
- Mould
- Maria (between 1845 and 1846 - circa 1884)
- Moulding
- Moule
- Lizzie (between 1869 and 1870 - circa 1936)
- Moulton
- Mouncher
- Mount
- Mountbatten-Windsor
- Mounter
- Mountford
- Selina (between 1812 and 1813 - 1877)
- Mountney
- Mounty
- Mousley
- Mouston
- Mowbray
- Mowcomber
- Mower
- Moxon
- Moy
- Moyle
- Moyler
- Kate (between 1857 and 1858 - circa 1934)
- Moyles
- Moyse
- Muckell
- Mudd
- Muddiman
- Mudge
- Muegerl
- Muggeridge
- Mugridge
- Muir
- Muirhead
- Mulcaire
- Mules
- Mulford
- Mulhall
- Mulholland
- Mullaly
- Mullen
- Muller
- Mullett
- Mullin
- Mullings
- Mullington
- Kate (between 1870 and 1871 - circa 1933)
- Mullins
- Mumford
- Munday