My Grandfather, James Gilroy 1872-1940, was supposedly from Collooney before emigrating to Glasgow. He had two or three brothers, Michael being one of them. He married Mary Flaherty whose parents were Daniel Flaherty and Mary Clarke. I have found Flaherty and Clarke in Cartonhugh townland in GV. The only Gilroys that I have been able to find in the general area are;
1. 1901 Census, A John Gilroy ( 1880-00) listed as a visitor at Mc Daniel house in townland of Correagh, adjacent townland to Cartonhugh.
2. I have a Thomas Kilroy born Oct 1,1870 , Collooney born to Mary Flaherty
3. A reference to an Abigail Gilroy married to a Thomas McCabe from Corhawnagh townland in an Ancestry.com post.
4 A reference to a Miss Norah Gilroy, Ballisodare as a passenger returning to visit in May 1913 from New York.
Does any of this happen to correspond to your research ?