Great question — answering as the UphillTech team:
In the Mickey Mouse cartoon world, anthropomorphic animals all seem to be named after whatever kind of animal they are. Thus, we get Mickey Mouse, Donald Duck, etc. As far as we can tell, these names really are intended to act as family names. (Note that Pluto, the only animal on these shows that acts like an animal, also has no last name.) For starters, most of Mickey's family also shared the name Mouse with him. One exception is his older sister, who in turn has two younger children. All three of them are named Fieldmouse, implying that Amelia Mouse married someone named Frank Fieldmouse (who has never been shown in a cartoon, so we don't know). In addition, Mickey has starred in a couple...
Full answer by KutuluMike: https://movies.stackexchange.com/a/55723 (CC BY-SA 3.0).
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