I'm not sure, but this reminds me of my own ancestors (in Menslage, near Fürstenau, Osnabrück, 1600's). The first man along the male line carrying my surname was born with a different surname, and then received the surname of his wife when he married her. This was written down in later records as ...'genannt' ...
This was a (local?) custom, but more common also in other places, that when a woman had inherited the farm, her surname would be the one that was transferred to the family of her and her husband.