I have a William O'Brien who married into our Walsh family of Skeagh Skibbereen in the 1870s. William was from Kilkilleen, a few miles southwest of Skibb. Also, have many Donovans who married into the family (all from Skibb area).
You can contact me at firstname.lastname@example.org
if you are interested in exploring this further.
Barbara in St. Louis, Missouri USA