Re O'Halloran, Clare County. My great-grandmother was Mary Halloran, Halloran or Hallorann. She was born in Co. Clare, 10 Dec 1845. Probably in Ogonelle, Scariff or a place called Killowa. She died 24 Dec 1935. She had one sister. Her father's name was Martin O'Holloran and her mother's name was Mary Hopkins O'Holloran. Hope there is a connection with your O'Halloran.