Thanks for the reply. I think Loughfouder is near Fahaduff. Mary O'Connor, your great grandmother, could be related to my great grandfather, Thomas O'Connor. I don't remember any O'Sullivan's being mentioned as neighbors in Fahaduff when my father was growing up there. I'll have to ask my cousins who are still in Castleisland about that.
There were Daly's and Connell's and Lynches living there. The Lynches are still there.
You might already know this, but the barony of Iraghticonor in North Kerry is called in Irish Oireacht-Ui-Chonchobhair -- O'Connor's iraght or Inheritance.