[Ger-Poland-Volhynia] real people?

[Richard Benert]

Glacier
I am reading at the moment a somewhat novelistic story about the Deportation 
of 1915 by one Bernhard Schwarz.  The book is "Wolhyniendeutsches 
Schicksal", published posthumously (Schwarz was killed in the war while 
writing it) in 1942. It appears to be factually based, but I can't be 100% 
sure.  It would  help if I knew that the people he mentions were real 
people.  Can anyone identify the following:

Andreas Wunsch  (from Adamowka, apparently), who seems to be the 
story-teller. Had a son named Georg.
Johann Marquardt (from Niespodzianka) and his son, Adolf (from Adamowka?)
Rudolf Stammer (from Amelyn)
Alexander Grönke and his father, Ferdinand (from Adamowka?)
Friedrich Loh
Wenzel Stolz (from Zelanka)

Any help is much appreciated.

Dick Benert