- Mabey
- Macaw
- MacCulloch
- MacGregor
- MacHado
- Mack
- MacKenzie
- MacKrill
- Madarieta
- Madden
- Madigan
- Madry
- Madsen
- Maes
- Magaw
- Magazino
- Maglajac
- Maglecic
- Magni
- Magnuson
- Maguire
- Maguregui
- Mahana
- Mahaney
- Maher
- Mahn
- Mahoney
- Maino
- Mairs
- Mais
- Major
- Malamakal
- Malberg
- Mallory
- Malmin
- Malmstrom
- Malone
- Maloney
- Maloof
- Manda
- Maness
- Manhalter
- Manion
- Manker
- Mann
- Mansfield
- Manship
- Manubay
- Manwaring
- March
- Marcinkowski
- Marcum
- Marczuk
- Mares
- Mariman
- Markel
- Marker
- Marko
- Markowitz
- Marks
- Marlatt
- Marlow
- Marmillion
- Marr
- Marriott
- Marrs
- Marsden
- Marsh
- Marshall
- Marske
- Marsters
- Martell
- Martenson
- Martin
- Martindale
- Martinez
- Martini
- Martinson
- Marty
- Mason
- Massey
- Mastalski
- Masters
- Masterson
- Mathews
- Matley
- Matlock
- Matsumura
- Mattara
- Matthes
- Matthews
- Matthiesen
- Mattison
- Matunas
- Maughan
- Mausling
- Mauzerall
- Mavencamp
- Maw
- Maxey
- Maxfield
- Maxie
- Maxwell
- May
- Mayne
- Mays
- Maywhoor
- McAdams
- McAfee
- McAlister
- McAllister
- McAnaney
- McAnany
- McArthur
- McBride
- McCallum
- McCammon
- McCarter
- McCarthy
- McCarty
- McCaughey
- McClanahan
- McClay
- McCleary
- McClelland
- McClenahan
- McClung
- McColly
- McColm
- McComb
- McCombs
- McConnaughey
- McConnell
- McCosh
- McCoy
- McCreath
- McCreedy
- McCue
- McCurdy
- McCurry
- McDaniel
- McDevitt
- McDonagh
- McDonald
- McDonough
- McDougal
- McElroy
- McEnaney
- McFall
- McFarland
- McGaha
- McGarvey
- McGee
- McGinness
- McGinnis
- McGlochlin
- McGovney
- McGrath
- McGraw
- McGregor
- McHargue
- McHugh
- McIntier
- McIntosh
- McIntyre
- McKay
- McKenney
- McKenzie
- McKibben
- McKinney
- McKlveen
- McKnight
- McKown
- McLane
- McLenna
- McLeod
- McMahan
- McMahon
- McManamen
- McMaster
- McMeekan
- McMurdie
- McNamara
- McNarie
- McNees
- McNeill
- McNeilly
- McPherson
- McRae
- McShay
- Mead
- Meadows
- Meagher
- Mecham
- Mecier
- Mehl
- Mehrens
- Mehrhoff
- Meinburg
- Meiners
- Meinhardt
- Meis
- Meistrell
- Melby
- Melgaard
- Mellon
- Mellow
- Melton
- Melvin
- Menard
- Mendella
- Mendenhall
- Mendiola
- Menter
- Menzner
- Merchant
- Mercil
- Meredith
- Merkle
- Merrick
- Merrill
- Merritt
- Mersch
- Merz
- Meserole
- Messinger
- Metsker
- Metz
- Meunier
- Meusch
- Meyer
- Meyers
- Michael
- Michaels
- Michalski
- Michel
- Michels
- Michener
- Michno
- Mickelson
- Mickey
- Middlekauff
- Mikesell
- Mikhalev
- Milburn
- Miles
- Miletich
- Miley
- Millard
- Miller
- Millett
- Millick
- Milligin
- Millington
- Mills
- Milton
- Minckler
- Miner
- Minnich
- Minnick
- Minskoff
- Minter
- Miracle
- Miranda
- Mitchell
- Mitsri
- Mittleider
- Moberly
- Mock
- Modica
- Moen
- Mohlsick
- Mohr
- Molchan
- Moll
- Mollerup
- Mondada
- Money
- Monroe
- Montagne
- Montaney
- Montgomery
- Montzka
- Moodie
- Moody
- Moon
- Mooney
- Moore
- Moorefield
- Moorehouse
- Moorhouse
- Morache
- Mordhorst
- Morehead
- Morehouse
- Morelan
- Morell
- Moreno
- Morf
- Morford
- Morgan
- Morgensen
- Moris
- Morrell
- Morrey
- Morris
- Morrison
- Morrisroe
- Morriss
- Morse
- Mortensen
- Mortimer
- Moser
- Moss
- Mothersill
- Mott
- Moulton
- Mowry
- Moxham
- Moyer
- Mudegowda
- Mueller
- Muffley
- Muir
- Mulcahy
- Mulick
- Mull
- Muller
- Mullins
- Mummey
- Munden
- Munger
- Munroe
- Munson
- Murelaga
- Murphy
- Murray
- Musselman
- Musser
- Mutch
- Myers