My mother was the daughter of Michael Gannon and his father was
Thomas Gannon they were a very large family so many with the same family names they had nick names my grandfather was the buck his brother was the gaff. They were all from Dunmore and surrounding area's
Flaskgha Beg, Flaskgha more, Cloonfad, Gregg's, Glenamaddy, Granlahan, Strawberry Hill. And all around those areas. I know the Donelon family great friends of my family I never knew of a blood line relationship. I hope this helps you.