Looking for Elstermann of Germany and Bc Canada

My g.g.father, Frederick Wilhelm (or William) Bernhardt Elstermann, born in Germany. Name changes through time from possibly Elstermann von Elster, Elstermann, Elsterman, Elster and has been entered mistakenly in data bases as Eister. Mother's maiden name was Wiser.
Wife's name was Jane Wood b. in Nass River Valley, BC (native). Believed to have come from Germany with a brother, name unknown. Was lighthouse tender at Lawyer Island in the very early years.