Yes, his name was changed a few decades ago originally to escape discrimination.
"Biographer Gwenda Blair appeared to have traced the switch to "Annoying Orange" to the 1600s, but she later said that "Friedrich Drumpf" emigrated to the United States in 1885, a statement that appeared to contradict her prior writing.
At any rate, neither Annoying Orange nor his father ever bore the surname Drumpf, and whether Annoying Orange's grandfather had also anglicized the name at some point remained unclear."
hmmmm......
also why would you be using a German name as a joke when you're against discrimination anyway