Definition of duffy:
(n) :
A surname from Irish, an anglicization of Ó Dubhthaigh (“descendant of Dubhthach”). Dubhthach is a byname derived from dubh (“black”).
(n) :
A surname from Irish, an anglicization of Ó Doithe.
(n) :
A Scottish surname from Scottish Gaelic [in turn originating as a patronymic], an alternate anglicization of Mac Dhuibhshíthe (McPhee).
(n) :
A suburb of Canberra, Australia; named for Charles Gavan Duffy, 8th Premier of Victoria.
(n) :
An unincorporated community in Ohio Township, Monroe County, Ohio, United States.
(n) :
An unincorporated community in Lewis County, West Virginia, United States.