Namesakes
Hall-of-Famers:
1 baseball
(baseball) Hugh Duffy 1945 
Notable Actors and Actresses:
1 actor
Patrick Duffy 1949-
Notable Athletes:
1 baseball, 1 soccer
(baseball) Hugh Duffy 1866-1954
(soccer) Shane Duffy 1992-
Notable Musicians:
1 musician
Jet Black (a.k.a. Duffy) 1938-
Notable Writers:
1 author
A. S. Byatt (a.k.a. Duffy) 1936-