The Irish and Scottish surname Duffy is an anglicized form of Gaelic  name Ó Dubhthaigh  meaning “descendant of Dubhthach”, a byname derived from dubh meaning  “black.” Thus the literal meaning would be “son of the black-haired one.”This name was borne by a 6th-century saint who was archbishop of Armagh. An early reference to the name in The United States was James Duffy, a famine emigrant, who embarked from Derry to New York on board the "Mary-Harrington", on June 2nd 1846.Today there are over 38,000 people with the family name Duffy living in The United States.

DUFFY FAMILY CREST CUFFLINKS