The surname Diffley is an Anglicization of the original Irish O Duibhghiolla, from the Gaelic meaning "black" and "lad."
, located on the west coast of the Island, where it belonged to two different septs, the Ui Fiachrach in the southwest of the county and the Siol Anmchadha in the southeast.
This web page shows only a small excerpt of our Diffley research. More information is included under the topic Early Diffley History in all our PDF Extended History products
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of this family name include: Devilly, O'Devilly, Diffley, Devally, Deffely, Deely and many more.
Some of the first settlers of this family name or some of its variants were: Peggy and Thomas Devally, who immigrated to St. John, New Brunswick in 1834; Patrick, Mary, George, James, and Bridget Deffely, who landed in New York in 1847.