Doolan

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File:Ireland900.png showing the location of Ulaid circa 900 A.D.]]

Doolan (Irish: Ó Duibhleachain) is a surname of Irish origin. They were chiefs of the Clan Breasail Mac Duileachain in the Ulaid sub-kingdom of Dál Fiatach, specifically located in what became the barony of Castlereagh.John O'Hart, Irish Pedigrees; or, The Origin and Stem of the Irish Nation, 5th edition, in two volumes, originally published in Dublin in 1892, reprinted, Baltimore: Genealogical Publishing Company, 1976, Vol. 1, p 819

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