 Ghost of Dr. Coffin, villain in the Scooby-Doo/Dynomutt Hour episode "The Harum Scarum Sanitarium".The "ghost" is revealed to be Officer Oldfield.John Coffin, detective in the mystery novel series by Gwendoline Butler
Jonathan Coffin, "Nonno" in Tennessee Williams' play "Night of the Iguana"
Mistress Coffin, murder victim in the novel "The Strange Death of Mistress Coffin" by Robert Begiebing.