I am a from the third generation of Jahncke Peru. My great grandfather came to South America in the early 1900s and married a Peruvian, had three sons and one daughter. His name was Friederich Jahncke (not sure if there was a second name). Contact me if there is someone interested in more details. And if there is someone around who is the descendant from one of my greatgrandfather brothers or sisters, let me know.