The name Roy is a form of Rufus. Saint Roy was the first bishop of Avignon in the south of France. That was the place where the Popes were exiled, seven of them, from the year 1309 to 1377.
Avignon, Palace of the Popes, taken from the Tower of Philip the Fair,
photo by Jean-Marc Rosier from http://www.rosier.pro, CC BY-SA 3.0, Link
