My mother's maiden name was Knoche from her father Gerhard Knoche (deceased) who was married to Louise (deceased) and they lived in Hamburg.
I now live in Toronto, Canada but I grew up visiting Germany often. SoI got to see my grandparents and my Tante Hiltrud and Onkel Henning, and my cousins Holger, Kristine, Sandra, Nina and Timo.
Onkel Henning recently passed away in Hamburg. His children are the only ones who carry the Knoche name, but none of them have had children (yet). My other cousins had four children altogether, but the rest of us have different family names.
My cousin Holger Meyer who now lives in Mannheim created quite a large family tree for us and mailed them all out.
I remember this family tree has at least 2 generations listed before Gerhard.
It is buried deep inside some boxes so I cant get to it at this moment, but maybe when I dig it out again I could find out if there are any connections for you folks.