Crypto-Jews: What's In A Name?
Over the millennia that Jews have wandered into many many countries, they have always changed their Names to "blend in" with the native people of each host nation.
Historically in Europe, the Caucasian Christian natives could tell which Surnames were used by Jews because Europeans were homogeneous cultures, and therefore aware of foreign Jewish migration into their Gentile lands. Over the centuries, Christians knew which were Christian names and which were not.
In America, it was/is much easier for Jews and Crypto-Jews to "blend in" because America has immigrants from every country on Earth.
The US has aprox. 168,000 different Surnames so it's not obvious which names are Jewish, except for the handful of obvious ones like: Weinstein, Schiff, Edelman, Kagan, Goldberg, Lebenthal, etc.
Many Jews also changed their names to Anglo-Saxon names which appear white European and Christian, not Jewish.
However, even with nose jobs, the Genetics are there if you pay attention.
Believe your eyes, not the Crypto-Jewish names that don't appear Jewish.
Book: Book of Jewish and Crypto-Jewish Surnames (DNA Consultants Series on Consumer Genetics) (Volume 3)