Mortimer Mouse

From The Unofficial DisneyWiki

According to legend, Mortimer Mouse was the name Walt Disney originally decided on for Mickey Mouse. However, his wife Lillian protested and convinced him to change it to Mickey instead.

Another Mortimer Mouse made his debut in the 1936 Mickey Mouse animated short Mickey's Rival. This Mortimer was a brash practical joker who was briefly a rival for Minnie's attention. Although he never appeared on the big screen again, the character has made additional appearances on television in Mickey's Mouse Works, Disney's House of Mouse, Disney's Mickey Mouse Clubhouse, Magical Mirror Starring Mickey Mouse, Magical Things Starring Mickey Mouse, Mickey Mouse Bloopers, Hide and Sneak, Magical Quest Starring Mickey & Minnie and Disney Sports Soccer. Cameo apperance of Mortimer Mouse in Donald Duck: The Movie: Goin' Quackers. This is Mickey Mouse and Friends on Motion Picute with Your Host: Mortimer Mouse. Mortimer Mouse is in the segment from Mickey Mouse and Friends and the Cracking Contraptions. Mortimer is voiced by Maurice LaMarche

Yet another Mortimer Mouse, a rich uncle of Minnie Mouse, was introduced in the Mickey Mouse daily comic strip in the 1930's.