Familie Kückelheim / von Kückelsheim

Dear Sir:
     I descend from the von Kueckelsheim family of Rorup through marriage
into the von Amelunxen family. The oldest in that line is Hermann von
Kueckelsheim who lived in the 1500s. I cannot find much information about this family
and I do not know how Kueckelsheim is related to von Kueckelsheim.
Sheridan Randolph
Cleveland, Tennessee, USA