Carey / McCaffrey families with DNA links to Barret's, Kilcoyne's and Gallaghers from Murrevagh and Achill Island

My Great Great Grandparents Anthony Carey (b 1811 in Castlebar) and his wife Mary McCaffrey (Cafferkey) emigrated to Canada prior to 1840, first settling in Quebec. I have no knowledge of their siblings or parents. I have a very strong DNA link to others whose ancestors came from Murrevagh, Mulraney and Achill Island. A possible relative is Mary Carey b about 1842 in Murrevagh who married Thomas Barret and emigrated to Ohio. Any information would be appreciated.