- Maack
- Maag
- Maas
- Maass
- Mabo
- Mabry
- MacAluso
- MacAulay
- MacBrair
- MacCarone
- MacConnell
- MacDonald
- MacDonell
- MacDowell
- Mace
- MacEachen
- MacEnko
- MacFarland
- MacGregor
- MacHen
- MacHesky
- MacHock
- MacHt
- MacHuga
- MacIariello
- Mack
- MacKe
- MacKey
- MacKie
- MacKlin
- MacKris
- MacOn
- MacVeigh
- Madden
- Maddox
- Maddux
- Maddy
- Madia
- Madill
- Madison
- Madix
- Madlener
- Madsen
- Madson
- Madyun
- Maegly
- Maerki
- Maffeo
- Magalis
- Magee
- Magenheim
- Mages
- Magge
- Maggio
- Magill
- Magliano
- Magnarini
- Magner
- Magnoni
- Magocsi
- Magrino
- Magro
- Mahadevan
- Mahaffey
- Mahan
- Mahanes
- Maher
- Mahlenkamp
- Mahli
- Mahon
- Mahone
- Mahoney
- MAI
- Maier
- Maifeld
- Mailender
- Maines
- Maiorano
- Mairose
- Maisch
- Majchszak
- Majors
- Makin
- Makoski
- Malagari
- Malanchuk
- Malas
- Malay
- Malblanc
- Malderle
- Maldonado
- Male
- Maleas
- Malenfant
- Maley
- Malik
- Malinauskas
- Maline
- Malinoff
- Mallard
- Mallari
- Mallick
- Malloni
- Mallory
- Mallow
- Malloy
- Malof
- Malone
- Maloney
- Malott
- Malthouse
- Maltinsky
- Maltry
- Maly
- Mancini
- Mancuso
- Mandel
- Manderschied
- Manegold
- Manes
- Manfresca
- Mangan
- Mangat
- Manger
- Manggrum
- Mangham
- Mangold
- Mangus
- Manhart
- Manigault
- Manion
- Manis
- Manley
- Mann
- Manner
- Manning
- Mannix
- Manos
- Mansfield
- Mantei
- Manuel
- Manz
- Mapel
- Maples
- Mapp
- Mappes
- Maras
- Marcagi
- Marcellus
- Marchand
- Marchetti
- Marchioni
- Marconet
- Marcotte
- Marcum
- Marcus
- Marek
- Maren
- Maret
- Margeson
- Margolis
- Marien
- Marinakis
- Mariol
- Marioles
- Marion
- Mark
- Markarian
- Marker
- Markham
- Markle
- Marko
- Markowich
- Marks
- Marksberry
- Marksity
- Markstein
- Markus
- Marley
- Marlman
- Marlowe
- Marmer
- Marquardt
- Marques
- Marrero
- Marrocco
- Marrone
- Marrs
- Marsala
- Marschall
- Marschner
- Marsh
- Marshall
- Marsteller
- Martens
- Marthaler
- Martin
- Martina
- Martindell
- Martineau
- Marting
- Martini
- Martino
- Marty
- Maruca
- Marx
- Marxen
- Marzig
- Mascari
- Mashni
- Maslowski
- Mason
- Massa
- Massari
- Massaron
- Massengale
- Masset
- Massey
- Massie
- Mast
- Masters
- Masterson
- Mastin
- Mastriani
- Mastruserio
- Masur
- Matani
- Matchett
- Mathauer
- Matheney
- Matheny
- Mather
- Matherly
- Mathers
- Mathes
- Matheson
- Matheus
- Mathews
- Mathey
- Mathis
- Matlock
- Matre
- Matson
- Matt
- Mattei
- Matthew
- Matthews
- Mattimore
- Mattingly
- Mattis
- Mattlin
- Mattox
- Mattson
- Mattstedt
- Matz
- Matzkofz
- Mauch
- Maue
- Maull
- Maume
- Maundrell
- Mauntel
- Maupin
- Maurer
- Maurmeier
- Maury
- Maushart
- Mautz
- Mavridoglou
- Maxey
- Maxwell
- May
- Mayall
- Mayberry
- Mayborg
- Maybrier
- Maybury
- Maycox
- Mayer
- Mayers
- Mayes
- Mayfield
- Mayhaus
- Mayle
- Maynard
- Maynus
- Mayo
- Mayrhofer
- Mays
- Mayzlik
- Maze
- Mazes
- Mazuk
- Mazza
- Mazzaro
- Mazzei
- Mazzela
- Mazzeo
- Mazzone
- McAdams
- McAfee
- McAffry-Davidso
- McAllister
- McAlpin
- McAneney
- McAninch
- McArthur
- McAtee
- McAuliffe
- McBrayer
- McBride
- McCabe
- McCafferty
- McCaffrey
- McCain
- McCalla
- McCallister
- McCamey
- McCane
- McCann
- McCarley
- McCarren
- McCartan
- McCarthur
- McCarthy
- McCartt
- McCarty
- McCaster
- McCauley
- McClain
- McClellan
- McClendon
- McClintock
- McClish
- McCloud
- McClung
- McClure
- McClurg
- McClymonds
- McCollum
- McComas
- McConaughy
- McConihay
- McConn
- McConnell
- McCord
- McCorkle
- McCormick
- McCosh
- McCourt
- McCowan
- McCoy
- McCracken
- McCray
- McCreary
- McCudden
- McCullars
- McCulley
- McCullough
- McDade
- McDaniel
- McDay
- McDermott
- McDevitt
- McDonagh
- McDonald
- McDonnell
- McDonough
- McDonouth
- McDougal
- McDougle
- McDowell
- McElfresh
- McElhaney
- McElroy
- McElvain
- McElwee
- McEnaney
- McFaddin
- McFarland
- McGaha
- McGannon
- McGee
- McGeever
- McGeorge
- McGhee
- McGill
- McGinis
- McGinn
- McGinnis
- McGirr
- McGlynn
- McGoff
- McGonegle
- McGoron
- McGowan
- McGownd
- McGrady
- McGrail
- McGrath
- McGraw
- McGregor
- McGrew
- McGrory
- McGruder
- McGue
- McGuffey
- McGuiggan
- McGuinness
- McGuire
- McGurn
- McHale
- McHenry
- McHugh
- McIlvain
- McIlvoy
- McIlwraith
- McIntosh
- McIntyre
- McKee
- McKenna
- McKenney
- McKenzie
- McKeown
- McKernan
- McKibben
- McKillip
- McKillop
- McKimm
- McKines
- McKinley
- McKinney
- McKinnon
- McKnight
- McLagan
- McLain
- McLaughlin
- McLean
- McLemore
- McLennan
- McLeod
- McMahan
- McMahon
- McMamara
- McMannis
- McManus
- McMillan
- McMillian
- McMonegle
- McMullen
- McMullin
- McMurray
- McNally
- McNamee
- McNanie
- McNeal
- McNeil
- McNeill
- McNulty
- McOsker
- McPeak
- McPheeters
- McPherron
- McPherson
- McPheters
- McPhillips
- McQuaide
- McQueen
- McQuery
- McQuesten
- McQuilkin
- McRae
- McSherry
- McSwain
- McSweeney
- McSwigan
- McSwiggin
- McVay
- McWeeny
- McWhorter
- McWilliams
- Meacham
- Mead
- Meade
- Meader
- Meador
- Meadows
- Meakin
- Meal
- Meale
- Means
- Meanwell
- Mear
- Meatchem
- Mechley
- Mechlin
- Meckbach
- Medcalf
- Medecke
- Meder
- Medkeff
- Medl
- Medley
- Medlock
- Meece
- Meehan
- Meek
- Meents
- Mees
- Meese
- Mefford
- Megrue
- Mehal
- Mehl
- Meibers
- Meier
- Meiering
- Meiers
- Meiman
- Meinecke
- Meinerding
- Meiners
- Meines
- Meinhardt
- Meinken
- Meinking
- Meirose
- Meisberger
- Meise
- Meisel
- Meiser
- Meisman
- Meisner
- Meissner
- Meister
- Meixner
- Melch
- Melcher
- Melchiorre
- Meldon
- Melford
- Melia
- Melik
- Melillo
- Melink
- Melish
- Mellen
- Mellett
- Mellman
- Mello
- Mellon
- Melnyk
- Meloy
- Melson
- Meltebrink
- Melton
- Melville
- Melvin
- Memke
- Memory
- Menard
- Mench
- Mendenhall
- Mendicino
- Mendlein
- Mendralski
- Menefee
- Menefield
- Menetrey
- Meng
- Menke
- Menkhaus
- Menner
- Menninger
- Meno
- Mensah
- Mensing
- Mentlow
- Mentrup
- Mentzel
- Menz
- Menze
- Menzel
- Menzer
- Meranda
- Meranus
- Mercer
- Merchant
- Mercurio
- Merdinger
- Meredith
- Mergenthal
- Merhley
- Merida
- Merk
- Merkel
- Merkes
- Merkhofer
- Merkl
- Merkle
- Merle
- Merling
- Mermelstein
- Merrell
- Merrick
- Merrill
- Merriman
- Merritt
- Merriweather
- Merry
- Merryman
- Mersch
- Merschbach
- Merse
- Mershon
- Mersman
- Mersmann
- Mertens
- Merusi
- Merz
- Mescher
- Meshesha
- Meshot
- Messemer
- Messer
- Messerly
- Messerschmidt
- Messerschmitt
- Messinger
- Messingschlager
- Messman
- Messmer
- Messner
- Meszoros
- Metcalfe
- Methven
- Metsch
- Mette
- Mettler
- Metts
- Metz
- Metzel
- Metzger
- Metzler
- Metzner
- Meucci
- Meurer
- Meyer
- Meyers
- Meyman
- Miars
- Michael
- Michaels
- Michaelson
- Michalski
- Michaud
- Michel
- Michelman
- Michels
- Michelson
- Mickey
- Mickle
- Middendorf
- Middendorff
- Middlekamp
- Middlemas
- Middleton
- Mideli
- Mider
- Midkiff
- Miele
- Mielke
- Mierenfeld
- Mietta-Fontana
- Mihailoff
- Mihovk
- Miille
- Miklavcic
- Milazzo
- Milbourne
- Milbrandt
- Milby
- Mileham
- Miles
- Miley
- Milkuhn
- Millard
- Millender
- Millennor
- Miller
- Millett
- Millhouse
- Milligan
- Milliken
- Milliron
- Mills
- Milne
- Milner
- Milton
- Mimms
- Minardi
- Mincer
- Mincy
- Mindrum
- Minges
- Mingo
- Miniard
- Minich
- Minium
- Mink
- Minks
- Minneci
- Minnich
- Minnick
- Minning
- Minniti
- Minor
- Minter
- Mintkenbaugh
- Minton
- Minturn
- Minutolo
- Mion
- Miracle
- Miramont
- Miree
- Mirizzi
- Mirlenbrink
- Misch
- Mischenko
- Miskinis
- Mitchell
- Mitchem
- Mitro
- Mitter
- Mittermiller
- Mitts
- Mitzman
- Mixich
- Mixon
- Miyasato
- Mize
- Mizell
- Moak
- Moats
- Mobley
- Moccia
- Mock
- Mocsny
- Moczydlowski
- Modafari
- Modaffero
- Mode
- Moeggenberg
- Moehle
- Moehring
- Moehringer
- Moeller
- Moellering
- Moellers
- Moellman
- Moening
- Moerdyke
- Moerlein
- Moermond
- Moertle
- Moeser
- Moeves
- Moffat
- Moffitt
- Mogle
- Mogoto
- Mohan
- Mohaupt
- Mohn
- Mohr
- Mohs
- Mojzer
- Moka
- Molen
- Moll
- Moller
- Molleran
- Mollmann
- Molloy
- Moloney
- Molony
- Molski
- Molt
- Molter
- Momberg
- Monaco
- Monaghan
- Monahan
- Monday
- Mondillo
- Mondro
- Mongan
- Mongelluzzo
- Mongenas
- Moning
- Moniot
- Monk
- Monnig
- Monroe
- Monson
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- Montague
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- Montecalvo
- Montesi
- Montgomery
- Monzel
- Mooar
- Moody
- Moon
- Moone
- Mooney
- Moonitz
- Moore
- Moorer
- Moores
- Moorman
- Moormann
- Moorwessel
- Moose
- Mootoo
- Moran
- Morano
- Morari
- Moratschek
- Morehart
- Morehead
- Moreira
- Moreland
- Morelli
- Morency
- Moreton
- Morgan
- Moriarty
- Morin
- Morr
- Morrell
- Morress
- Morris
- Morrison
- Morriss
- Morrissey
- Morrow
- Morsch
- Morse
- Morthorst
- Morton
- Mosby
- Moscoe
- Moscove
- Mosely
- Moser
- Moses
- Moskowitz
- Mosley
- Moss
- Mossey
- Moster
- Mots
- Motz
- Moubray
- Mouch
- Moulas
- Moulton
- Mount
- Mountel
- Mowry
- Moy
- Moye
- Moyer
- Moynahan
- Mpagi
- Mraz
- Mrzlack
- Muccillo
- Muchmore
- Muckenfuss
- Mudersbach
- Muehlenkamp
- Mueller
- Muench
- Muenchen
- Muenich
- Muething
- Mugler
- Mugrage
- Muhlenpoh
- Muhlhauser
- Muhlhofer
- Mukasa-Mayanja
- Mulcahey
- Mulcahy
- Muldoon
- Mulkey
- Mullaney
- Mullen
- Muller
- Mullett
- Mulligan
- Mullikin
- Mullin
- Mullins
- Mullis
- Mullucey
- Mulroy
- Multhaup
- Multhopp
- Mulvaney
- Mulvey
- Mulvihill
- Mummert
- Mumper
- Munafo
- Munch
- Muncy
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- Mundon
- Mundstock
- Mundy
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- Munninghoff
- Munson
- Murch
- Murdaugh
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- Murphree
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- Murrer
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- Murtaugh
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- Mushaben
- Musick
- Musselman
- Musser
- Mussig
- Mussio
- Muth
- Mutters
- Muzzo
- Myer
- Myers
- Myles
- Mynatt
- Myres
- Mysliviec