I would guess that if a surname appeared in a book of Jewish
families, it means that, at one time, there was a Jewish family with
that surname. But was it the same family, or did someone convert, or
adopt, etc.? you were looking at the 17th century, and the "hint"
is >from the 19th century.
....... tom klein, toronto
Subject: Germany, Lists of Jewish Families >from Five Cities insnip..........