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.[1]

Map of medieval Gaelic Ireland showing the location of Ulaid circa 900 A.D.

Notable people

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See also

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References

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  1. ^ 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