I have a McCormack in my line as well. It was Bridget McCormack born about 1820 in Ireland and died in Pembroke July 24, 1894. She married James Cadden. She was my gr-gr-gr grandmother on my father's mother's side. Bridget and James had 5 children that I have traced, Jane, James, Sylvester, Thomas, and John. I don't have any info on Bridget's parents. Don't know if there is a connection but thought I would put it out to you.