I have relatives that were Boyle/O'Donhell from Burtonport as well. My grandmother was Bridget Boyle and she had brothers,Sean and Niall. Her father was Charles Boyle. The Irish Census will be the most help. There are a lot of smaller areas near there like Maghery and Lakenac but the whole area is full of Boyles. The local Catholic church St. Columba and the cemetery is on the island of Kitch.