MK = Martin Luther King, Jr and Sr.
ML - Martin Landau
MM = Marilyn Monroe
MN - Mike Nichols
MO = Marie Osmond
MP - Mount Pleasant (several places in Australia, Canada, the UK and the US)
MP = Michael Palin from Monty Python
MQ - Marilyn Quayle
MR = Margot Robbie or Mickey Rooney or Meg Ryan
MS- Martha Stewart
MT - Mary Travers or Mike Tyson
MU - Montevideo, Uruguay
MV - Martin Van Buren
MW - Martha Washington
MX - Malcolm X
MY = Michael York
MZ - Mark Zuckerberg
NA - New Amsterdam (i.e., New York City)
NB = Ned Beatty
NC- Nell Carter