After going through all available vital records on Irish Genealogy, census and other records (including my own files) I have found that both Robert Allen of Glenleary and William Allen of Camus married in Dunboe area and were almost certainly from there before coming to those Macosquin townlands.
Robert Allen (c1823-1912), Glenleary, married Elizabeth Henry and had the following children (could be others that dies young, etc.)- Nancy, William, John, Sarah Jane (mother of 3 illegitimate children), Margaret Anne, Joseph, Mary Ann, James, Robert.
William Allen (c1809-1891), Camus, married Margaret Anne Cameron and had the following children (again, could be others I've not found yet)- Margaret Jane, John, James, Esther, Elizabeth.