Well I'll be. That is so cool. Thanks!
http://www.etymonline.com/index.php?term=sheriff&allowed_in_...
Edit: Allow me to repay in kind. Did you know that rhubarb is called "rhubarb" because the Greeks thought only barbarians would eat it?
http://www.etymonline.com/index.php?term=rhubarb&allowed_in_...