Gary, I saw this post and thought I would send you some names and phone numbers to kumm's in Knox County and Pierce County.I am not married to a kumm anymore but I know that they came from Hanover, Germany to West Point, NE and settled in Bloomfield, Wausa, and Osmond, NE.There are 2 other clans that settled in Winnatoon and Randolph, NE that are not related.
Some names that I remember is Paul R. Kumm (father-great grpa to ex), Lucille Kumm Springer (daughter), Otto Kumm (son), Norman Willis Kumm (son--and ex's grandpa), to name a couple.There are some first cousins:Duane Kumm, Wausa, NE; Wes Kumm, Osmond; and Marvin Kumm, Wausa.
Helen Hansen Kumm was married to Norman Willis Kumm resides in Osmond, NE.402.748.3458 begin_of_the_skype_highlighting 402.748.3458 end_of_the_skype_highlighting (?)
Paul Kumm married Carol Ann Clough Kumm and resides on the farm in Osmond.402.748.3845
These will give you a good start and hopefully they can share some more information or point you to the right direction, as I don't remember any more names.