Namesakes
Hall-of-Famers:
1 baseball
(baseball) Hugh Duffy 1945 
Notable Actors and Entertainers:
2 actors
Patrick Duffy 1949-
Julia Duffy 1951-
Notable Athletes:
1 soccer
(soccer) Shane Duffy 1992-
Notable Musicians:
2 singers, 1 musician
Jet Black (a.k.a. Duffy) 1938-2022
Keith Duffy 1974-
Duffy 1984-
Notable Writers:
1 author
A. S. Byatt (a.k.a. Duffy) 1936-