There are 72 unique mother surnames beginning with M:

Mabrey	Mackline	Magee	Malone	Mannasmith	Mansperger	Mapes
Markley	Marks	Marling	Marshall	Martin	Martindill	Mast
Masters	Mather	Mathers	Mattox	Mayfield	McAdams	McAdow
McBeth	McCall	McCamey	McClimans	McCloud	McCombs	McCormick
McDaniel	McDougall	McDowell	McElroy	McEntire	McFadden	McFaddon
McIlroy	McIntire	McKelvey	McKirgan	McKitrick	McNeal	McPeck
McPherson	Mechen	Melching	Mellinger	Michael	Middleton	Miller
Millikin	Mills	Minthorn	Mitchell	Moffitt	Monroe	Montgomery
Moody	Moore	Morford	Morgan	Morgridge	Morris	Morrison
Morrow	Moshier	Mouser	Mulligan	Mullvaine	Mulvaine	Mummey
Murphy	Myers

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