Doolan is the surname of ancient Gael royals. The Doolan (I. O`Duibhleachain) were chiefs of the Clan Breasail Mac Duileachain in an area of Gaelic Ireland`s Ulidia (kingdom) near modern Kinelarty now in the Barony (Ireland) of Castlereagh. ==Notable people== ...
Doolan is New Zealand slang for a Roman Catholic, especially an Irish one.