Namesakes
Fictional Characters from Movies:
1 character
Dewey 1938 Donald's Nephews 
Fictional Characters from Television:
1 character
Dewey Wilkerson 2000 Malcolm in the Middle
Nobel Prize Winners:
1 medicine
(medicine) James Watson (a.k.a. Dewey) 1962
Notable Actors and Entertainers:
1 actor
Winsor Harmon (a.k.a. Dewey) 1963-
Notable Scientists and Inventors:
1 biologist
James Watson (a.k.a. Dewey) 1928-
Rock and Roll Hall-of-Famers:
1 musician
Dewey Martin 1997 Buffalo Springfield