Some of my ancestors were German. They came over three generations before the revolution and settled in the Hudson River valley. The name is not too common and so is not viewed as a “German” name.
That being said, my great-grandfather went by the nickname, the Dutchman, in WWI probably so as not to be thought of as German. His family had been here for over 200 years at that point and this was in Kansas City.
There was a story last year that Pres. Trump’s grandfather (also named Fred) had allowed people to believe he was Dutch for the same reason, after the family moved to Queens during WWI.
OT: Fred (grandfather) Trump made a fortune in the Klondike Gold Rush.