M&M
Maëva
Ma Petit Fleur ("my little flower")
Macaroni
Macho
Mack
Madison
Mae
Mage
Maggie
Magic
Magnolia
Magnum
Maisie
Major
Malcom
Malo
Mambo
Manchugo
Mandy
Mango
Mangus
Mara
Marahl
Marble
Marcel
Marie-Sophie
Marina
Mario
Mark
Marlon
Marmek
Mars
Marshmallow
Martin and Luther
Martini
Marty
Marvin
Marv
Mary Poppins
Matilda
Maude
Maurice
Mawdryn
Max
Maxim
Maurice
Maxwell
Maxy
Mayday
McDuff
McGee
McGyver
McKeal
McZee
Mckee
Meander
Meatloaf
Meelee
Megabyte
Megan
Megara
Melissa
Mellow
Mercedes
Merecobi
Merla
Merlin
Merry
Mesina
Mia
Micah
Michael
Michaela
Mickey
Micky
Midget
Midori
Miekel
Mieko
Miffy
Mike
Milky
Milo
Milt
Mimi
Mindy
Mini-Me
Mini-me + AustinPowers (for two)
Misty
Minnie
Miscellaneous
Misha
Mina
Mississippi
Missy
Mist
Misty
MoBo
Moby
Mocha
Mocho
Mojo
Mokie
Moley
Molly
Molotov
Monet
Monkey
Monster
Monty
Moocher
Moonlight
Morgan
Moron
Morpurgo
Morris
Moses
Motley
Mountain
Mouse and Ham
Moxie
Mozart
Mr.Bean
Mr. Bob
Mr. Nibbles
Mr. Sniffy
Mr. Ted
Mr. Whiskas
Mr. and Mrs. (Hamster)
Mr Magoo
Mr Spock
Mrs Muffin
Muffin
Muffy
Mugs
Munchkin
Munk
Murphy
Murray
Mushroom
Mushy
Mysty