This message is in response to your May 2008 posting which I just ran across. My great grandfather is John Jahnke. He lived in Waconia, Minnesota for some 20 years. I believe he is a younger brother of Friedrich Janke. When he immigrated to Minnesota from Prussa his name was Johann Janke. He change the spelling of his name some time there after. Several newspaper articles in the 1880's made the connection between the two Jankes. Unfortunately, I do not know when he left Prussa and the names of his parents. Are you aware of any other brothers and sisters that Friedrich may have had?