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For GRONER check out this:

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http://www.ancestry.com/search/SurnamePage.aspx?sourcecode=13304&html=b&fn=&ln=groner&submit.x=0&submit.y=0

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LOTTMANN is not in my books. But for LOTTER I found this:
Occupational name or byname from Middle High German "lot(t)er" meaning "good-for-nothing, rascal, juggler, buffon".
Or else it could be from the given name LOTHAR or maybe LUDWIG.
"-mann" is often found as an addition to a name, giving no specific additional meaning.