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Jean Simmons' middle name was Merilyn. She was born Jean Merilyn Simmons on January 31, 1929, in London, England. Simmons was a British actress who appeared in over 100 films and television shows throughout her career. She is best known for her roles in films such as "Hamlet" (1948), "The Robe" (1953), and "Elmer Gantry" (1960).