Marshall \m(a)-rsha-ll, mar-shall\ as a boy's name is pronounced MAR-shal. It is of Old French origin, and the meaning of Marshall is "caretaker of horses". Occupational name. Also a law enforcement title and a military title of great honor. Common in Scotland as a first name since the early 19th century. Department store founder Marshall Field; media theorist Marshall McLuhan; actor David Marshall Grant; Supreme Court Justice Thurgood Marshall; football player Marshall Faulk; pop singer Marshall Mathers.