Here's the paper The Erway/Ervay/Ervey Family, the descendants of Conrad Ervay, an 11-page
outline of the family's origins, migrations and branches. It was written by Chip Erway and should
answer most of your genealogical questions!
The document is available in two formats. The PDF version is best for printing and includes five pages of scanned attachments. The web page version is best for a quick read online and contains only the text.