- Maan
- Mabane
- Mabbutt
- Maberly
- Mabey
- Mably
- Mabon
- MacAdam
- Macafee
- Macaleese
- MacAllister
- MacAlpine
- MacAndrew
- Macarthur
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- Macartney
- Macartney-Filgate
- Macaskie
- Macaskill
- MacAskill
- Macassey
- Macaulay
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- Macauley
- MacBean
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- MacBride
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- MacCallum
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- MacCaw
- MacCleary
- MacColl
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- MacCraw
- MacCullagh
- MacCullum
- MacDermot
- Macdiarmid
- MacDiarmid
- Macdona
- MacDonagh
- Macdonald
- MacDonald
- MacDonald-Jones
- Macdonell
- Macdonnell
- MacDonnell
- Macdonogh
- Macdougall
- MacDougall
- Macdowall-Grant
- Macefield
- Macellan
- MacEwan
- MacEwen
- Macey
- Macfadyen
- Macfarlane
- MacFarlane
- MacFarquhar
- Macfie
- Macgougan
- MacGowan
- Macgregor
- MacGregor
- Machan
- Macharia
- Machin
- Machray
- Maciejowska
- MacIlwaine
- Macinerney
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- MacInnes
- Macintosh
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- Macintyre
- MacIntyre
- Maciver
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- Mack
- Mackarness
- Mackay
- MacKay
- MacKean
- MacKellar
- Macken
- Mackenzie
- MacKenzie
- Mackeson
- MacKessack-Leitch
- Mackfall
- Mackie
- MacKillian
- Mackillop
- MacKillop
- Mackinder
- Mackinlay
- MacKinlay
- Mackinnon
- MacKinnon
- Mackintosh
- Macklin
- Mackrory
- Mackworth
- Mackworth-Praed
- MacLachlan
- Maclagan
- Maclaire-Hillier
- MacLaren
- Maclay
- Maclean
- MacLean
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- MacLennan
- Macleod
- MacLeod
- Macliver
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- Maclure
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- MacNab
- Macnaghten
- MacNaghten
- Macnair
- MacNair
- Macnamara
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- Macnaughton
- MacNeil
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- Maconie
- Maconochie
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- MacPherson
- Macpherson-Grant
- MacQuarie
- MacQuarrie
- Macqueen
- MacQueen
- Macquisten
- Macrae
- MacRae
- MacRobert
- MacShane
- MacSween
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- Mactaggart
- MacTaggart
- MacTaggart-Stewart
- MacTavish
- MacWhinney
- Macy
- Maddan
- Madden
- Maddern
- Madders
- Maddin
- Maddison
- Maddock
- Maddocks
- Maddox
- Madel
- Madeley
- Maden
- Madgwick
- Madison
- Maelor-Jones
- Maffia
- Mafoh
- Magan
- Magee
- Magenis
- Mager
- Maggs
- Magher
- Maginness
- Maginnis
- Magnay
- Magniac
- Magnum
- Magnus
- Magonet
- Magpie
- Magrath
- Maguire
- Mahabadi
- Mahal
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- Mahammed
- Mahapatra
- Maher
- Mahfouz
- Mahmood
- Mahmud
- Mahon
- Mahoney
- Mahony
- Mahotiere
- Maiden
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- Mailer
- Máille
- Main
- Maines
- Mainey
- Main-Ian
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- Mainwaring-Ellerker-Onslow
- Mair
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- Maisey
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- Majainah
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- Majid
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- Majorowicz
- Mak
- Makgill
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- Mall
- Mallaber
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- Mallalieu
- Mallam
- Mallen
- Mallender
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- Malley
- Mallik
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- Mallock
- Mallon
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- Mallory
- Malloy
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- Mama
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- Mandeville
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- Manfield
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- Mangnall
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- Manik
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- Mann
- Mannan
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- Manning
- Manningham
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- Mans
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- Margerison
- Margesson
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- Marjoram
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- Markwick
- Marland
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- Massie
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- Masterson
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- Masud
- Matabudul
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- Matheson
- Mathew
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- Mathias
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- Mathis
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- Matsell
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- Mattey
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- Matthissen
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- Matts
- Mattu
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- Maughan
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- Maur
- Maurice
- Mauro
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- Mawer
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- Maxfield
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- Maxwell
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- May
- Mayall
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- Mayes
- Mayhew
- Mayho
- Maylin
- Maynard
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- Mayor
- Mayou
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- McAndrew
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- McAuley
- McAvoy
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- McBrinn
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- McCaig
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- McCan
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- McClarty
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- McClintock
- McClintock-Bunbury
- McCloskey
- McCloy
- McClure
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- McClymont
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- McCool
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- McCoubrey
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- McCreadie
- McCreadle
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- McCrossan
- McCubbin
- McCue
- McCullagh
- McCulloch
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- McCullogh
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- McCurley
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- McDade
- McDaid
- McDermid
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- McDougal
- McDougall
- McDowall
- McDowell
- McEldowney
- McElduff
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- McElrea
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- McEnhill
- McEntee
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- McEvoy
- McEwan
- McEwen
- McFadden
- McFadyean
- McFall
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- McFarlane
- McFarling
- McFatridge
- McGann
- McGarel
- McGarel-Hogg
- McGarry
- McGartland
- McGarvey
- McGavigan
- McGaw
- McGeachy
- McGeagh
- McGeary
- McGeechan
- McGeever
- McGeorge
- McGeough
- McGetrick
- McGhee
- McGibbon
- McGiffin
- McGill
- McGilley
- McGilligan
- McGilligan-Fell
- McGillycuddy
- McGimpsey
- McGinley
- McGinn
- McGinnity
- McGinty
- McGladdery
- McGlade
- McGlashan
- McGleenan
- McGlinchey
- McGlone
- McGlynn
- McGoldrick
- McGonigal
- McGough
- McGovern
- McGowan
- McGrady
- McGrandle
- McGrath
- McGrattan
- McGree
- McGregor
- McGrellis
- McGrenera
- McGrigor
- McGuffie
- McGuffin
- McGugan
- McGuigan
- McGuiggan
- McGuiness
- McGuinness
- McGuire
- McGuirk
- McGurk
- McGurran
- McHale
- McHallam
- McHardy
- McHugh
- McIlhone
- McIlroy
- McIlveen
- Mcilvenna
- McIlvenna
- McIlwane
- McInnes
- McIntosh
- McIntyre
- McIsaac
- McIver
- McIvor
- McKane
- McKay
- McKeag
- McKeague
- McKean
- McKears
- McKechin
- McKechnie
- McKee
- McKeever
- McKell
- McKellar
- McKelvey
- McKendrick
- McKenna
- Mckenzie
- McKenzie
- McKenzie-Hill
- McKeon
- McKeown
- McKerchar
- McKercher
- McKernan
- McKerrell
- McKibbin
- Mckie
- McKie
- McKiernan
- McKilliam
- McKillop
- McKim
- Mckinlay
- McKinlay
- McKinnell
- McKinney
- McKinnon
- McKitterick
- McKnight
- McLachlan
- McLagan
- McLaggan
- McLaine
- McLancy
- McLaren
- McLaughlan
- McLaughlin
- Mclean
- McLean
- McLeavy
- McLeish
- McLellan
- McLelland
- McLennan
- McLeod
- McLernan
- McLetchie
- McLevy
- McLoughlin
- McLusky
- McMahon
- McMahon-Morris
- McManus
- McMaster
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- McMicking
- McMillan
- McMillan-Scott
- McMillen
- McMinn
- McMinnies
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- McMorrin
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- McMurdo
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- McNab
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- McNally
- McNamara
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- McNamee
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- McNaught
- McNee
- McNeil
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- McNeillie
- McNerney
- McNicholl
- McNicol
- McNish
- Mcnulty
- McNulty
- McPartland
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- McPherson
- McPhie
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- McQuade
- McQuarrie
- McQueen
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- McRae
- McRandal
- McRobert
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- McShane
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- McTaggart
- McTigue
- McVay
- McVeagh
- McVeigh
- McVey
- McVicar
- McWalter
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- McWhirter
- McWilliam
- McWilliam-Fowler
- McWilliams
- Meacham
- Meacher
- Meacock
- Mead
- Meade
- Meaden
- Meades
- Meadowcroft
- Meadows
- Meads
- Meager
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- Meakin
- Meale
- Mear
- Meares
- Mearing-Smith
- Mearns
- Mears
- Meates
- Mechan
- Medd
- Medgyesy
- Medhurst
- Medland
- Medley
- Medlicott
- Medway
- Medwell
- Meech
- Meechan
- Meegan
- Meehan
- Meek
- Meekins
- Meeks
- Meeson
- Megaw
- Meggitt
- Meggs
- Meghani
- Meghji
- Megson
- Mehboob
- Mehmet
- Meighan
- Meikle
- Meiklejohn
- Mekie
- Melaugh
- Melding
- Meldon
- Meldrum
- Melhuish
- Melia
- Meling
- Mell
- Mellanby
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- Mellick
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- Mellon
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- Mellstrom
- Melly
- Meloy
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- Meltzer
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- Mendel
- Mendelson
- Mendl
- Mendoza
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- Mennie
- Menniss
- Menon
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- Meredudd
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- Mereweather
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- Meropoulos
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- Merron
- Merry
- Merryfield
- Merryweather
- Merton
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- Meston
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- Metcalf
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- Metge
- Metheringham
- Methuen
- Meurig
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- Meyer
- Meyler
- Meynell
- Meynell-Ingram
- Meyrick
- Meysey-Thompson
- Miah
- Miall
- Mian
- Michael
- Michaelis
- Michaelson
- Michaluk
- Michell
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- Michetschlager
- Michie
- Michna
- Micholls
- Mickle
- Micklem
- Mickler
- Micklethwait
- Middelwood
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- Middleditch
- Middlehurst
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- Middleweek
- Middup
- Midgley
- Mieklejohn
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- Miéville
- Mighton
- Mikardo
- Miklinski
- Milani
- Milbank
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- Mildmay
- Mildren
- Mildwater
- Miles
- Milford
- Miliband
- Mill
- Millam
- Millan
- Millar
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- Miller
- Miller-Jones
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- Millett
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- Millican
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- Milliken
- Milling
- Millington
- Million
- Millns
- Mills
- Millson
- Millward
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- Milne
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- Milnes
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- Milroy
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- Milton
- Milvain
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- Miney
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- Minoprio
- Minott
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- Minton
- Mir
- Miraj
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- Mirza
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- Miszeweka
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- Mitchel
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- Mitchell-Cotts
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- Mitchelson
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- Mitchison
- Mitford
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- Mobberley
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- Mogford
- Moghal
- Mohammed
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- Mohanty
- Moher
- Mohindra
- Mohr
- Moir
- Mokrzycki
- Mold
- Molden
- Mole
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- Molesworth
- Molesworth-St-Aubyn
- Molik
- Moller
- Mollet
- Molloy
- Moloney
- Molony
- Molson
- Molteno
- Molyneaux
- Molyneux
- Monaghan
- Monahan
- Monck
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- Monckton-Arundell
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- Moncreiff
- Moncur
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- Mondair
- Money
- Money-Coutts
- Monger
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- Monkhouse
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- Monks
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- Monro
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- Monsell
- Monsey
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- Monteith
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- Moodie
- Moody
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- Moosun
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- Mordecai
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- Moreing
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- Morey
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- Morgan-Danvers
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- Morgan-Harris
- Morgan-Harvey
- Moriarty
- Morice
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- Morland
- Morley
- Morley-Scott
- Moroney
- Morpeth
- Morphet
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- Morrice
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- Morrison-Bell
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- Mort
- Mortensen
- Mortimer
- Morton
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- Moses
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- Mosutafa
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- Mount
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- Mountford
- Mountney
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- Moxon
- Moy
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- Mozar
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- Muchall
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- Muckley
- Mudd
- Muddyman
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- Mugglestone
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- Mukhopadhyay
- Mularczyk
- Mulcahy
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- Mulhearn
- Mulhern
- Mulholland
- Mulia
- Mullan
- Mullane
- Mullaney
- Mullany
- Mullarky
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- Mullender
- Muller
- Mullett
- Mulley
- Mulligan
- Mullin
- Mullings
- Mullins
- Mulloy
- Mulrenan
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- Mulvany
- Mulvenna
- Mulvey
- Mumby-Croft
- Mumford
- Munday
- Mundell
- Mundella
- Mundy
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- Munn
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- Munro
- Munro-Butler-Johnstone
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- Munt
- Munthe
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- Munyambu
- Murat
- Murch
- Murchison
- Murday
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- Murgatroyd
- Murie
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- Musa
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- Muskett
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- Mustapha
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- Mutamiri
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- Muter
- Mutter
- Mwaba
- Myatt
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- Myerscough
- Myhill
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