Mickey Mouse is his name. He was named by Walt Disney's wife; Lillian. Walt had originally thought his name should be Mortimer Mouse, but, Lillian preferred Mickey Mouse and that is what they named him.
When the character was originally created, his name was supposed to be Mortimer Mouse. Walt's wife Lillian convinced Walt to change the name to Mickey Mouse. (The actor Mickey Rooney is on record as saying he was the inspiration for the name change.)
mickey rooney Not really true. Mickey Rooney however did cross paths with Walt Disney at the Warners Bros. studio. But, Walt Disney originally was to name what is known as Mickey Mouse "Mortimer". But his wife, Lillian, persuaded him to name the mouse "Mickey".