McCook from Kilbeacanty (Galway) -to America mid 1850's

On a slim lead, I have seen an old ad posted by a Patrick McCook of Milton, Norfolk MA in about 1856 looking for his brother Peter McCook, last in Virginia (US). He says he is from Kilbeacanty, near Gort. It is entirely possible that the Peter McCook there is my Peter McCook b c 1823 m Catherine Lougherty b c 1830 (based on the fact that I have an ancestry DNA autosomal match with the Patrick McCook line).Peter McCook had a brother named Brian McCook who married a Johanna Garity (Gerarty) b c 1850, in Iowa (US). Another common name carried down through these 2 families is Bernard. I assume it's possible that the name might also be Cooke, or even McHugo, etc. 

Is it possible to trace back family records through the parish that far back. Or is there anyone that lives in Galway in the Gort area that has any clue about these names? I am certain that the Patrick McCook in Milton MS is from Gort (married Mary Barry, children Bridget, Katherine, John, Michael) but not as confident that Patrick is a brother to my Peter and Brian. Also on the 1850 Milton Norfolk MA census, a James Bruggy 35 is in hte houshold, leading me to believe he is somehow kin. There was, for example, a Patrick Cooke b 1803 in Gort that married a Mary Bruggy b 1821. 

Incidentally, my brother McCook has done a YDNA test (male to male to male) which makes it a straight shot to determine ancestry or at least known matches based on a paternal line. . He matches another McCook that was in Jamaica and I wonder if that could have been kin to Henry McCook/McHugo of Rosepark

Any help to know where to look or write or if there are any living Cookes or McCooks or McHugos  in that area that might be of this line, would appreciate comment.