The Irish surname Dunphy is of patronymic origin. The name Dunphy is derived from the old Gaelic name O' Donnchaidh, meaning " son of or descendant of Donogh ". The 2 families of the name were found in counties Sligo and Kilkenny and many of their descendants are still found in these area today. Today there are approximately 3,600 bearers of the surname Dunphy living in the United States.
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