I have been wondering what would it be like to have the infamous surname. Looks like other people were also curious about it.
The Guardian comments:

What did Hitlers change their names to after the second world war?
…A look into the electronic telephone book shows no Hitler in all Germany, but 24 Hittler and still 3 Hiedler. So, possibly, the addition of another "t" (which doesn’t change pronunciation) might be the answer to the second question…

Okay, they changed their names. So does this make an interesting case that a surname has been artificially wiped out?

Some people not only maintain the surname but also the given name:

Adolf Lu Hitler R. Marak is a politician in the state of Meghalaya, India.
It may be noted that his name is not particularly curious within Meghalaya, where other local politicians are named Lenin R. Marak, Stalin L. Nangmin, Frankenstein W. Momin, or Tony Curtis Lyngdoh. Hitler Marak told the Hindustan Times: "Maybe my parents liked the name and hence christened me Hitler… I am happy with my name, although I don’t have any dictatorial tendencies."

Muy curioso.