The name M&M’s is so familiar that most people rarely stop to wonder what those two letters actually mean. The answer comes from the surnames of the two men behind the candy: Forrest Mars Sr. of Mars and William F. R. Murrie, whose father was president of Hershey at the time. Their collaboration gave the famous chocolate candy its simple, memorable name.

The idea for M&M’s emerged in the late 1930s, when Forrest Mars was searching for a way to make chocolate easier to carry in warm weather. He was reportedly inspired by chocolate candies covered in a hard sugar shell. That coating helped protect the chocolate from heat and eventually became one of the defining features of the product.

M&M’s were officially introduced in the United States in 1941, and their practical design quickly proved useful. The firm sugar shell helped prevent the chocolate from melting as easily, making the candies convenient to transport and store. During World War II, their durability also made them particularly useful for military rations.

Over time, M&M’s became known for more than just their convenient design. The colorful candies, distinctive shape, and tiny lowercase “m” printed on each piece helped create one of the most recognizable candy brands in the world. Their appearance and color selection have evolved considerably since the early days.

So, the next time you reach for a handful of M&M’s, take a second look at those familiar letters. They aren’t simply a catchy name—they represent the surnames of the two men whose partnership helped create one of the world’s most recognizable chocolate candies. Sometimes, the story behind a familiar name is more interesting than you might expect.