Multiple stories exist to explain the origin of Wilson's nickname: By one account, a New York newspaper held a nicknaming contest; the winning entry was "Hack" because he reminded many fans of another stocky athlete, the popular wrestler Georg Hackenschmidt. In another version, McGraw is said to have remarked that Wilson's physique was reminiscent of a "hack" (slang for taxicab in that era). Giants teammate Bill Cunningham claimed that the nickname was based on Wilson's resemblance to Hack Miller, an outfielder with the Chicago Cubs. The "New York Times" printed the first documented usage of "Hack" on June 10, 1924.