Both my wife and I have ancestral ties to the area you mention. My surnames
are Thies, Sielehr, and Ellebrecht. My wife's surnames are Thunhorst, and
Sasse. We have been to Trinity and Mount Zion Lutheran churches in Cleveland and
researched their records. We can also access them at the Western Reserve
Historical Society Library.
In Germany there is this website you should check out.
My ancestors are listed in the emigration sections. The webmaster, Wolfgang
Behrend, is very informed on this area of Germany.
Rick Wagner