Duffy is a surname of Irish origin that comes from the original Irish name Ó Dubhthaigh, meaning descendant of Dubthach. Dubthach was an Old Irish first name meaning "black". Variations include: Duffey, Duffee, Duff, Duthie, O'Duffey, O'Duffy, Duffe, O'Duffe, Dufficy, Doey, Dohey, Doohey, Duhig, Duhigg, Dowey and O'Dowey. The name originates from Connacht. It may refer to:

Irish

Australian

New Zealand

Scottish

Welsh

English

North American

Multiple entries

Duffey

Fictional character