Re: your lost of family surnames includes Sauerhering
There was a query published in Milwaukee's German newspapers for an Adolph, Eduard, and Rudolph Sauerhering by the Immigration Board in Milwaukee in 1886. They were identified as having emigrated 50 years beforefrom Prussia to Mayville, Wis.! The queries were published for relatives in Riga, Russia.
"Milwaukee's German Newspapers; an index of death notices and related items" (1844-1950). firstname.lastname@example.org
Indexing Milwaukee's German newspapers continuously since 2007 ... it's about German-American culture, not data.