From Ó Dubhagáin, ‘little dark one’ — hereditary chiefs of Fermoy in Cork, and a separate Uí Mhaine family that gave Ireland one of its great medieval poets.
The Duggan certificate.
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Gaelic Origin · Root meaning ‘little dark one’
Duggan anglicises Ó Dubhagáin, a diminutive of dubh, ‘dark’ or ‘black’ — read as ‘little dark one’, most likely a physical byname. One branch held Fermoy in County Cork as hereditary chiefs; a separate Ó Dubhagáin family belonged to Uí Mhaine in Galway and Roscommon, producing Seán Mór Ó Dubhagáin, whose fourteenth-century topographical poem cataloguing Ireland's Gaelic chiefs survives as a major source for medieval Irish history.
Two families, two provinces, one name — a Munster lordship on one side, and on the other a poet who wrote down the whole map of Gaelic Ireland while it was still standing.
Irish form: Ó Dubhagáin
