Mantle, Maris, Mtumbo, Mayes, Malone, Marino are 6 (all retired).
mousse
Merlot
Malt Malt
matriculate, maul, measure, maim
Some movies that start with the letter "m" are Monsters Inc., Madagascar, and Madagascar 2: Escape to Africa.
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 7 words with the pattern --O-T-M--. That is, nine letter words with 3rd letter O and 5th letter T and 7th letter M. In alphabetical order, they are: chowtimes noontimes odontomas prostomia showtimes sportsman sportsmen
Moronic is an insult. It begins with the letter m.
magnums
Martinez and Mendoza are Hispanic last names. They begin with the letter M.
an Olympic sport starting with m is marathon
A salad starting with the letter M could be a macaroni salad.
maltesers & m&ms