Hi I too am looking for O'SullivansMy great grandmother was Catherine O'Sullivan born I think 1861.  I think her parents were Mark and Anna(Newman or Nooman) O'Sullivan. She had brothers and sisters Mary1847, Eugene 1850, Mortimore 1850? and Denis 1855.  Catherine married Johnny Harrington, Lighthouse Keeper and lived on Dursey Island.  She is burried on Dursey Island in a family grave that goes back to 1774 but I do not know if she was born in Ireland or who else is buried with her.  She was said to be a chieftain's relative and not sure what that refers to.  Any help would be appreciated. Thank You, Caroleann Quan, California