FWICS, Fred Trump Sr.’s original last name was “Trumpf”.
Can't be bothered with Snopes.
But the Wikipedia says:
Trump has said that he "feels Scottish" and he is also "proud" of his German heritage, having served as grand marshal of the 1999 German-American Steuben Parade in New York City.[7][8] Drumpf, the family’s ancestral name, was changed to Trump during Germany's Thirty Years' War in the seventeenth century.[9]
So, yes, Fred, well before he arrived on our shores, went by Trump. But the old-country original name was nevertheless Drumpf. I wonder, how does that sound to Angela's ears? Which is more krautisch, Trump or Drumpf?
Not according to the Wikipedia article on Donald T.’s grandfather, which cites it as “Trumpf”.
But the old-country original name was nevertheless Drumpf
In 1885, at age 16, (Frederick) Trump emigrated from Bremen, Germany, to the United States aboard the steamship Eider, departing on October 7 and arriving at the Castle Garden Emigrant Landing Depot in New York City on October 19. U.S. immigration records list his name as “Friedrich Trumpf”, last place of residence as “Kallstadt”, country of birth as “Germany”, and his occupation as “farmer”. …The claim for the ancestral name being “Drumpf” rather than “Trumpf” comes from a book written by one Gwenda Blair, titled The Trumps: Three Generations of Builders and a Presidential C candidate, whose first edition apparently came out in 2001 and I have not heard of until now.