Hallo Johann, sorry, it has now taken a little time. I'm not sure if my family Claussen from Delve are related to the family of Bergewöhrde Claussen. It may be because between Delve and Bergewörde only a few kilometers apart. The Claussen descendants I have attached as a file. If everything is correct, one of the descendants is the cardiac surgeon Christiaan Barnard.
I have translated this text with Google. I hope it is understandable.
Many greetings from Germany