I assume there must be some people who are actually called Mickey Mouse. How do they manage when they try to vote in the USA?

Famous names do crop up in other places. I've known two Michael Jackson, both of them, as it happens, children's entertainers. Not a good name to have if you are a children's entertainer.

Then there was a young English reporter in the Chicago streets outside the 1968 Democratic Convention ("the World is Watching"), who got grabbed up by a cop and asked for his name. He said "Winston Churchill" and was promptly done over, as a hippy-loving Limey. In fact it was his name and he was Churchill's grandson.