My family comes from Caheragh. I am interested in your post because of my connection. My line goes through Caheragh, my GGGfather was Patrick Hourihane from Caheragh, he was married to Nellie Collins from Killingleigh. Their children included (not complete list) Margeret, 08/01/1948;Mary, Aug 6, 1851; james, May 13, 1855; John April 27, 1857 (My GGF); Neil, AUg 4, 1862, Patrick Feb 25, 1865 and Cornelius, Nov 1, 1867.
Our two lines may be linked based on names you are looking for, they seem to recur each generation. If that is the case, we are looking for same family that produced Patrick and Mary, they could be siblings born around 1820's. Let me know if I helped.