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book
Clans & Families of Ireland
by John Grenham
John Grenham, Clans & Families of Ireland: The Heritage & Heraldry of Irish Clans & Families (Dublin, Ireland, Gill & Macmillan Ltd., 1993).
ISBN 0-7171-2032-5
Duffy, page 105
In Irish the suname O Dubhthaight, from dubhthach, meaning ‘the dark one.’ Several different families of the name arose separately in different places, the most important being in Donegal, Roscommon and Monaghan. In Donegal the family centred on the parish of Templecrone, where they remained for almost eight hundred years. The Roscommon family, too, had a long association with the church, producing a succession of distinguished abbots and bishops. The area around Lissonuffy in the northeast of the county, which is named after them, was the centre of their influence. From this source the name is now common in north Connacht. The Monaghan O’Duffys were rulers of the area around Clontibret. They also contributed a great deal to the church, with a huge number of parish clergy of the name. They flourished throught the centuries, and Duffy is now the single most common name in Co. Monaghan.
