Google gives me hits for Mary Goldstein, Mary Goldblatt, Mary Goldberg, Mary Goldblum, Mary Silverstein, Mary Silverberg, Mary Weinberg, and Mary Cohen. Whether they were born Jewish, or were shiskas who married Jewish men and took the name, I don’t know.
Mary Beth [Jewish name] may be more of a challenge. Every Mary Beth I ever knew was Catholic.
No Mary Weinblatts, though.