I don't recall Sir Terry ever referring to all the Rons. I think he once referred to the many different Dibblers by their names in a footnote, but the Rons are just there as individuals.
Ah. I don't have The Discworld Almanack, which is why I thought one of Tiffany's friends (I forget which) was the champion pig-borer. (And speaking of which, outside my parents' house there's a sign on an electricity pole that always amused me. It says, and I quote: "NO BORING WITHOUT PERMIT".)