- Mack
- MacKenzie
- Madden
- Maddox
- Maehl
- Magill
- Magley
- Maierle
- Malensek
- Maloit
- Mandera
- Mark
- Marquardt
- Marron
- Marsh
- Martin
- Marx
- Maser
- Masiak
- Mason
- Massaro
- Mathews
- Matlock
- Matross
- Matson
- Mattfeldt
- Matthies
- May
- Maykuth
- Mays
- Mazurek
- McBride
- McCahon
- McCann
- McCarthy
- McCarty
- McCauley
- McClure
- McCormick
- McCue
- McCullough
- McDonald
- McDonnell
- McFadden
- McFarland
- McGee
- McGuire
- McIntosh
- McJannet
- McKeon
- McKinney
- McLaughlin
- McLucas
- McMurtrey
- McNeil
- Meacham
- Meadows
- Mee
- Mehr
- Mehrens
- Melcher
- Meloy
- Mendel
- Mends
- Mergenthaler
- Merlau
- Meyer
- Meyeres
- Meyering
- Michalski
- Michel
- Middagh
- Midtlyng
- Milburn
- Miles
- Miller
- Millons
- Milot
- Miros
- Mitchell
- Mitchke
- Mitschke
- Mittleider
- Mohr
- Mongoven
- Moody
- Moon
- Mooney
- Moore
- Moots
- Morey
- Morris
- Morrison
- Motchenbach
- Mudro
- Mueller
- Mullen
- Mullings
- Mullins
- Mundt
- Munk
- Munoz
- Murphy
- Murray
- Myers
- Myles
- Myott