When Maximilian William of Brunswick-Lüneburg Imperial Field Marshal was born on 13 December 1666, in Duchy of Lüneburg, Holy Roman Empire, his father, Ernst August von Braunschweig-Calenberg I., was 37 and his mother, Prinzessin Sophie Dorothea von der Pfalz, was 36. He had at least 1 daughter with Unknown Woman. He died on 16 July 1726, in Vienna, Austria, at the age of 59.
German: possibly a metonymic occupational name for a fisherman, from orfe, a species of freshwater fish. Alternatively, a habitational name from Urff near Kassel, formerly Orpha.
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