A couple that come to mind are:
Malibu Rum
Moss Moon Moose Midge Mollusk
Mouth is a human organ. It begins with the letter m.
Miley Cirus
myth
Miller light Michelob ultra
maotai
mesclun
mocorrana
Methane is a gas. It begins with the letter m.
myth
Maryland is an American state. It begins with the letter M.
Madonna
Molson is a popular beer brand from Canada. It begins with the letter M.
My Chemical Romance Metallica Meatloaf Megadeth
stones and minerals starting with M: * magma * marble * magnrtite * malachite * mica
magnums
Moronic is an insult. It begins with the letter m.