Mac, Macmurrough, Macon, Maeldaf, Maelgwyn, Magnus, Maine, Malm, Manasses, Mannesson, Marche, Maredudd, Marshall, Martel, Martin, Massingale, Maud, Maurice, Mayenne, Mcdonald, Meek, Mentzer, Mercia, Merfyn, Metz, Meulan, Meulant, Meurig, Milhaud, Mills, Miner, Moha, Mohun, Molynes, Moncon, Montagne, Montbeliard, Montdidier, Montfort, Moore, Moorer, Mor, More, Mormaer, Mortagne, Mortimer, Moselle, Moulcon, Mousson, Moyvonne, Mucil, Mugmedon, Muncy