A newer resource since the 1998 posting lists about 50 occurrences of the Heinze name indexed from many local German newspapers. There are repeat entries for a John Willener dating from the 1850s.

"Milwaukee's German Newspapers; an index of death notices and related items" (1844-1950).
Gary Rebholz, compiler/editor
Milwaukee Wis.
gary.rebholz@gmail.com
Indexing Milwaukee's German newspapers continuously since 2007 ...