Dewey Finn, Main character in School of Rock
Dewey, younger brother of Malcolm, Reese and Francis in "Malcolm in the Middle"
"Walk Hard: The Dewey Cox Story"
Dewey Duck, one of Donald Duck's nephews
Dewey Decimal System, library cataloging/classification system
Dewey is a nickname for Deward Dwight "Dewey" Riley - character in the Scream franchise