Surname origination? DOBBERSTEIN/KRUGER #general

Karen M. Griffin <kareng@...>

I have recently found that my paternal great grandparents were Ed D.
Dobberstein and Pauline Kruger. A close friend who is Jewish suggested
that they may be Jewish names. Their daughter (my grandmother) was a
German Lutheran born in Poland. Just when I think I am getting the
information I need, it becomes more complicated. Is this possible? Could
my great grandparents have been Jewisdh? and How do I verify this?
Thanks for any help you may be able to provide,
Karen Griffin

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