Hello!
I too, am searching for information about the Yerian, line. My husband is a direct descendant through Mathias Jerion and have been able to trace the line all the way back to Conrad Irion born around 1530. At this point, I feel as though I have hit a wall as I cannot find anymore information about Conrad's father, except that his name is thought to be Heinrich Irion, and his mother's name was Catharina Bedmennin. Any help would be greatly appreciated, and I'll return the favor with whatever information I can, as well!