Sizemore is a family name that may refer to: Barbara Sizemore (1927–2004), educator, researcher from Chicago, headed Washington, DC schools Bill Sizemore (born 1951), political activist in Clackamas, Oregon Chris Costner Sizemore (1927–2016), patient with multiple personality disorder Grady Sizemore III (born 1982), professional baseball player for the Philadelphia Phillies Herschel Sizemore (born 1935), American mandolinist James Sizemore (born 1978), composer and orchestrator of film scores James Sizemore, American director of The Demon's Rook Jason Sizemore, American writer and editor Scott Sizemore (born 1985), professional baseball player, last played for the New York Yankees Susan Sizemore (1951–2020), American novelist Ted Sizemore (born 1945), former professional baseball player Tom Sizemore (born 1961), American film and television actor Surnames