These surnames are commonly Jewish (not always, but often), but I dont know why. What's the linguistic basis for this? They don't sound like a Hebrew, Greek, or Arabic surnames which you would expect from someone descended from people in the Levant. They sound Germanic to me. Was it one of those "Ok everybody, we need last names, if you're feeling lazy just pick a surname based on your industry. The Jews are big in the stonework industry, so there ya go"? It'd be like meeting a demographic claiming to be descended from Nigerians with the surnames "Erikson" and "Bjork".