Nancy, this is an old post so you might not be searching for this anymore but thought I would post it anyway. There is a William Ahearn that came from either Boston or Woburn Massachusetts in 1878 and helped to settle the town of O'Connor, in Greeley County Nebraska. I believe he was born abt. 1849 in Ireland. He married Mary Anne Cadegan and they had six children, one a daughter named Julia. Could be a coincidence. Good luck, Gene.