Hello - I stumbled upon your post while looking for other Coffey family members from Gortbrack. I am looking for a John Coffey (born act. 1849) and his wife Mary (born abt. 1854). They had at least four children: Michael, John, Daniel and Margaret. Michael and John were born in Ireland and Daniel and Margaret were probably born in Newark, NJ, after the family immigrated. I'm also trying to find a link to an O'Connor family in that area as well.
If any of this rings a bell, perhaps we could compare notes.