“Ullendorff - heck of a name for an English officer during WWII”
Not when you consider that the English King’s family name was “Saxe-Coburg and Gotha”.
Before changing it to Windsor during WW1 - Ullendorf does sound familiar though in reading WWII history. Also, the Kaiser was related to Queen Victoria as her grandson.
An American officer at the time was “Chip” Bohlen, whose relatives were the Krupp von Bohlen und Halbach family of the Ruhr.