I understand what you are saying. Many immigrants to this country changed their names in order to become more "Americanized" and accepted by the general population once they settled here.
For example, my next door neighbor's last name is "Thomas" but that's only because her father, a Polish immigrant, forced her to change it from Tomaczewski......
Another Polish decendent's last name is now Wojt which was changed from Wojtowski. Another individual's last name is Koster which his parents changed it to from Kostrzewski.........
So, many immigrants who came to this country were very concerned about how they would be accepted here and thus they went so far out of their way to try to "Americanize" their last names...........
It was a common thing to do and I have no problem with that.
With that being said, I do have a problem with the current stage names such as "Angelina Jolie" who was born to John Voigt and the cast of others who chose to change their names to sound more "exotic" to the adoring masses..........
Somehow, Bob Bumpus does not conjure up images of a tier one hollywood actor........LOL!
That is why a famous actor changed his name to Kermit the Frog from Kermit Bumpass.