There are Sullivans and Harringtons in my husband's family. They were from Kilcaskan and nearby Adrigole parishes. My successful search for them was made possible with the help of professional researcher Riobard O'Dwyer, Eyeries, Beara Peninsula, County Cork, Ireland. He can probably help you if you are willing to pay his fee.He has also written some books about the genealogies in the area.