My great grandmother was Tekla Piechna but I believe Piechowski was in our line somewhere (can't remember where I saw it). Tekla married Iwan Rak. Iwan lived in Ternophil for a while (believe he moved around to Poland and Ukraine) He was married at least twice. They had my grandfather Mikolaj Rak, and there were two other brothers (do not know names, but they were in US occupied Germany after WW2. They also had two daughter by a Catherine Hysa.
I also have an aunt Aleksandra Smiarowska who married a Marcel Kowalczyk in 1920. He was about 20 years older, and I don't know what happened to them, whether there were children or not. They were in Poland.
Unfortunately, I don't have any documents on the Rak, Piechna family in Ukraine. I did find two Piechna members came to the USA on the same ship as my grandfather in 1909.