Mary Ferdinando

I'm having problems connecting my direct line family member Mary Ferdinando born London 1701 married to Simeon Levi West born London 1700 and christened 10 Jul 1700 at St Lawrence Jewry, London. Logic tells me that she is probably the daughter of Isaac Ferdinando and Mary Humphries however I can't confirm this. The West family were a Crypto Jewish London family. Any one have the answer?