DUGGAN - The Irish Ó Dubhagáin has been transliterated as Duggan, Dugan and Doogan. The best-known Ó Dubhagáin sept was located in Fermoy barony in northen Co. Cork. Another was located in southern Co. Galway. Dugan and Dougan were the favoured spellings in east Ulster where families using that form of name predominate. Doogan is the spelling most often in Co. Donegal. The more numerious Duggan families predominate in Munster where their noticeably heavier distribution in Co. Tipperary denotes descent from the Fermoy sept. (5)

1. Scots and Irish: Anglicized form of Gael. Ó Dubhagáin 'descendant of Dubhagán`, a byname represeting a double dim. of dubh black, dark (see Duff).
2. Welsh: Anglicized aphetic form of the personal name Cadwgan, Cadogan, (see Caddock 1).

Patr. (from 2): Duggins.

Researching: - James Duggan   m. Mary Thornton   (c. 1865 Dublin IRE ?)