My gt-gt-gt-gt-grandparents, from somewhere in Co Mayo, were Hugh McNamara and Esther Flynn. He was a master cooper. They had at least 3 children, Mary, my gt-gt-gt-grandmother, married 1st Patrick Moran, he died probably about 1832, she then married Myles Gibbons, son of Jonathan Gibbons and Honor Teague or Dillon. Mary & Myles moved to Glasgow, Scotland about 1850 and they both died there.
Mary was born, I'm guessing, about 1810. Her brother Hugh was probably born about 1808, he died in Glasgow 1855. Another brother was called Derby, which seems to have been a common nickname for Jeremiah, he was born about 1802 and he also died in Glasgow.
There would have been other siblings who perhaps stayed behind in Mayo.
Myles Gibbons came from Burrishoole, so I'm guessing the McNamara family must have lived around there somewhere.