Someone descended from a line of Jewish mothers is halachically Jewish. Thus, if the daughter of a daughter of a Jewish woman marries a man whose father’s father’s father was Jewish, and thus has a Jewish name, the children will be Jewish and will have a Jewish name. Of course, there are also names which are sometimes Jewish and sometimes non-Jewish German, such as Weiss. In addition, names were often changed by immigration clerks. I know someone who knew a man named Cohen who was a Yisrael. He came to America with a long Polish name and the clerk asked why he couldn’t have a simple Jewish name like “Cohen”. He did not want o start up so he agreed.
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