Monika
Monique
Monk
Monkey
Monkey Face
Monkeybutt
Mono
Monochrome
Monroe
Monsanto
Monsieur
Monster
Monster Kitty
Monstrance
Montague
Montana
Monte
Monte Carlo
Montego
Monteque
Montezuma (after the Aztec god-king)
Montgomery
Montgomery Clift
Monther
Monty
Monty Python
Moo
Moo Moo Cat
Moo Moo Cow
Moo Shu