Well, I happen to be a descendant... My Grandmother's maiden name was Coppieters de Tergonde, she was one of the three daughters of Klemens Coppieters de Tergonde from Dobromil (now in Ukraine).
The Coppieters de Tergonde family was a part of a larger "klan" of Coppieterses from Flanders, Belgium -- there were several branches of them. The de Tergonde line is now extinct, the last two male members -- the two brothers of my Grandmother joined the Pilsudski's Legions, and were both killed on October 27 (or 28), 1914, in one of the very first Legions' actions.
I don't want to give my name here, but you may contact me by e-mail at: trurlzklapaucjuszem@gmail.
