Disney’s original name for the famous Mickey Mouse was Mortimer Mouse, until Walt’s wife Lillian convinced him to change it.
At one point, actor Mickey Rooney claimed that it had been named after him, after meeting Walt Disney at Warner Brothers studio; such claim has been debunked by Disney historian Jim Korkis.
Mortimer Mouse would be reborn as a new character, Mickey’s biggest rival after Pete. He’s like a taller Mickey and also looks more like a rat. Minnie also has a relative called “Uncle Mortimer”.