Hi - I don't know if you saw my post above. But your Robert Richlich is a brother to my great-grandmother Franziska Richlich.
You had mentioned in the other post about finding some Richlich's in Detroit and couldn't seem to find anything more. I am from Detroit. After my mother passed away, I found a business card on it in the name of Art Rich, my mother wrote a notation that he was cousin to my grandfather. Perhaps, some of the Richlich's followed him and had their name shortened?