I don't know where you are looking in WI. for your family, but I just got back home from a search for my family in Wisconsin. (They are all over the State!) :-(
There are LENTZ names in the Pound/Coleman (Oconto Co) area of WI. One of my cousins live on Lentz Rd west of Pound and I saw the name in some of the cemeteries I was searching thru.
Hope this helps
Lynne (Sasman) Bissell