I have a habit of taking an in-depth look into the misrepresentations of our ancestors, those we'd always believed were Christian. The conspiracy to hide Jewish ethnicity was a wide practice and many of our ancestors did so. Was that French Huguenot 9th grandfather really Jewish, hiding amongst Protestant religious sects to preserve his life? Did Perowski become Peters so the children could have a better life, free of persecution? You'll find that in many instances the answer to these questions was yes.
Suellen Ocean is the author of Secret Genealogy II, the Jewish Roots of Our Christian Ancestors, available at Amazon, B&N and Ocean-Hose.