Part of our family went to war and part didn't. The result was the change from Paranych to Paranich. The ones who volunteered were almost all "of age" but either one or two were not. So when they wrote the "ich" no one argued.
I'd start by trying to trace the Paranych tree. I've started a few times but life is too busy for me to look through the past, unfortunately. Good luck in your hunt.