There are 67 unique child surnames beginning with M:

Mader	Main	Malone	Marine	Marsh	Marshall	Mather
Mathys	Matteson	Mattison	May	Maybee	Mayer	Mayo
McAdow	McAllister	McBride	McCafferty	McCamey	McCampbell	McCarty
McClimans	McCloud	McCombs	McCormick	McCracken	McCurdy	McDaniel
McDowell	McElroy	McEntire	McFarland	McGinnis	McIlroy	McIntire
McKeever	McKinley	McKitrick	McLean	McMahon	McPherson	Meddles
Michaels	Michel	Middlesworth	Miller	Millington	Mills	Minor
Minthorn	Mitchell	Moder	Moehn	Moffett	Monson	Moore
Moran	Morey	Morgan	Morris	Moseley	Mosher	Moyer
Mullen	Mulligan	Mulvaine	Myers

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