It is Polly Vaughan - or Bawn, Ban, Von, or whatever the folk variations determine. The name is Celtic-influenced, and it translates as "little." (There's a South Wales village not so far away which goes by the name of Pontneddfechan, which translates as The little bridge across the river Neath, or The bridge crossing the little Neath. It goes by the Welsh-English hybrid name of Pontneathvaughan.)