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.
But he had ancestors named Drumpf, which they changed during the Thirty Years' War, 1618-1648, a long time before Fred Trump's time.
The question for today is, would the ascendancy of DJT to the American presidency be more offensive to today's Krauts if they knew he came from one of theirs, named Drumpf (or Trump). Hopefully, the answer is ja wohl! That's Schadenfreude on my part. Schadenfreude = ramming down their throats!