When Birthe Margrethe Olsen was born on 22 January 1854, in Tømmerup, Torup, Kronborg, Denmark, her father, Ole Pedersen, was 43 and her mother, Birthe Kirstine Hansen, was 38. She married Hans Nielsen on 20 February 1880. They were the parents of at least 2 daughters.
Some characteristic forenames: Scandinavian Erik, Nels, Nils, Lars, Alf, Thor, Niels, Sven, Jorgen, Helmer, Iver, Arnfinn.
Danish and Norwegian: patronymic from the personal name Ole, a short form of Olaf, Olav (see Olafsen ). This surname is the third most common in Norway. It is also established in northeastern England and in northern Germany. Compare Ohlsen , Olesen , Oleson , and Olson .
German (Ölsen): habitational name from any of several places so named, in Saxony, Brandenburg, and the Rhineland.