To all of you Purviance fans who have tried to determine where Castlefinn actually was, I can tell you that the road directions given by a contributor to this forum are correct. And surprise! There is a real, vital, charming village there today. In fact, two weeks ago my cousin and I had a wondeful lunch at a local restaurant on the main street. I believe it was called McGlynn's. When we inquired of an elderly gentlemen about the Purviance name variants, he directed us to the owner of the restaurant, saying, "She knows all about the history of these parts." And indeed, she directed us to a wonderful old church with an ancient graveyard. We did not find the names we were looking for, but I will be checking to find the cemetery listed on line. By the way, there is no "Castle" there today, nor any memory of one. But who knows what lies in history?
So put the town of Castlefinn on your itinerary for a future trip to northwest Ireland!