Also, Hitlers name wasn't really Hitler, just like Stalins name wasn't Stalin. It was Schicklgruber and Iosseb Bessarionis dse Dschughaschwili. So .. if you want to become a dictator, better use a catchy name the masses can chant.
https://en.wikipedia.org/wiki/Alois_Hitler#Change_of_surname
Some people at the time tried to insult Adolf Hitler as a Schicklgruber, not because he changed his name, but because his father was born in an extramarital affair.