I do not understand why you believe your speculations are more correct than others. Your post hstory does not support it.Another test of TERB logic.
If a Jewish person with the last name Rosenstein emigrates to England, and then "anglicizes" his name to Rose, is the ancestry of his name English or Jewish?
If somebody has a Dutch name is it more likely that he has Dutch heritage or that his name is a dutchification of a Prussian name?