Cy is a masculine given name, often a short form (hypocorism) of Cyril, Cyrus or Seymour, and a nickname. It may refer to:

In arts and entertainment

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  • Cy Chadwick (born 1969), English actor, director, producer and presenter
  • Seymour Cy Coben (1919–2006), American songwriter
  • Cy Coleman (1929–2004), American composer, songwriter and jazz pianist born Seymour Kaufman
  • Cy Curnin (born 1957), British singer, songwriter, and musician
  • Cyril Cy Endfield (1914–1995), American screenwriter, film and theatre director, author, magician and inventor
  • Seymour Cy Feuer (1911–2006), American theatre producer, director, composer and musician
  • Cy Gavin (born 1985), American artist
  • Cyril Cy Grant (1919–2010), Guyanese actor, musician, writer and poet
  • Cyrus Cy Hungerford (1889–1983), American editorial cartoonist
  • Cyrus Cy Kendall (1898–1953), American actor
  • Cy Kuckenbaker, American filmmaker
  • Cyril Cy Laurie (1926–2002), English jazz clarinetist and bandleader
  • Seymour Cy Leslie (1922–2008), founder of Pickwick Records and first president and founder of MGM/UA Home Entertainment Group
  • Seymour Cy Schindell (1907–1948), American actor
  • Cyril Cy Touff (1927–2003), American jazz bass trumpeter
  • Edwin Cy Twombly, Jr. (1928–2011), American painter, sculptor and photographer
  • Cyril Cy Walter (1915–1968), American café society pianist

Politicians

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  • Richard Cy LeBlanc (born 1955), Canadian politician
  • Cyril Sherwood (1915–1996), Canadian politician
  • Cy Thao (born 1972), Laotian-born American politician

In sport

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Baseball

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  • Cecilio Cy Acosta (born 1946), Mexican former Major League Baseball pitcher
  • Frederick Cy Alberts (1882–1917), American Major League Baseball pitcher in 1910
  • Eros Cy Barger (1885–1964), American Major League Baseball pitcher
  • Clytus Cy Bentley (1850–1873), American Major League Baseball pitcher
  • Darrell Cy Blanton (1908–1945), American Major League Baseball pitcher
  • Seymour Cy Block (1919–2004), American Major League Baseball player
  • Cyril Cy Buker (1918–2011), American Major League Baseball pitcher in 1945
  • Arthur Cy Fried (1897–1970), American Major League Baseball pitcher in 1920
  • William Cy Moore (1905–1972), American Major League Baseball pitcher
  • Harry Cy Morgan (1878–1962), American Major League Baseball pitcher
  • Cyril Cy Morgan (1920s pitcher) (1895–1946), American Major League Baseball pitcher
  • Ralph Cy Perkins (1896–1963), American Major League Baseball player, coach and manager
  • Kenneth Cy Rheam (1893–1947), American baseball player
  • James Cy Seymour (1872–1919), American Major League Baseball player and general manager and vice president of the Cleveland Indians
  • Cyril Cy Slapnicka (1886–1979), American Major League Baseball pitcher and executive
  • Edwin Cy Twombly (baseball) (1897–1974), American Major League Baseball pitcher in 1921
  • Henry Cy Vorhees (1874–1910), American Major League Baseball pitcher in 1902
  • Wallace Cy Warmoth (1893–1957), American Major League Baseball pitcher
  • Frederick Cy Williams (1887–1974), American Major League Baseball player
  • Ceylon Cy Wright (1893–1947), American Major League Baseball player in 1916
  • Denton Cy Young (1867–1955), American Major League Baseball Hall-of-Fame pitcher

Hockey

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  • Cyril Cy Denneny (1891–1970), Canadian National Hockey League player
  • Cyril Cy Thomas (1926–2009), Welsh-born National Hockey League player
  • Marvin Wentworth (1904–1982), Canadian National Hockey League player

Other sports

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  • Cy Alexander (born 1953), American college basketball head coach
  • Charles Cy Casper (1912–1968), American National Football League player
  • Cy Marshall (1902–1974), American race car driver
  • Jack Cy McClairen (1931–2020), American former National Football League player and college football and basketball head coach
  • Shirley Cy Wentworth (American football) (1904–1986), American National Football League player
  • Burton Cy Williams (American football) (1903–1965), American Football League and National Football League player
  • Cy Young (athlete) (1928–2017), American javelin thrower, 1952 Olympic champion
  • Harry Young (American football) (1893–1977), American college football and basketball player and head coach, and sprinter, member of the College Football Hall of Fame

In other fields

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  • Salim L. Lewis (1908–1978), American business executive, managing partner of Bear, Stearns & Company