Do you know that in Hollywood there are actually more famous actors that go by stage name than their real name? It has become a common practice in the past for celebrities to change their birth name, and go by a stage name. For example, I am sure you are well aware that Lorde was not bestowed with such a name. Not every stage name is obvious.
There are different reasons why actors and celebrities change their name. Sometimes, it is simply just so they don’t get mistake with other actors. For example, Katy Perry was born Hudson, so she changed her last name because she didn’t want to get mixed up with the actress Kate Hudson. Michael Keaton was actually born Michael Douglas, and that is another example of mixing up. Others change their name to sound more glamorous. And then there are actors that change their name just so that the name is shorter.