Whose nickname was Sparky?

George Lee "Sparky" Anderson.

Anderson is fifth on the all-time list for manager career wins in Major League Baseball (behind Connie Mack, John McGraw, Tony La Russa and Bobby Cox) and is the first manager to win the World Series while leading clubs in both leagues. He piloted the National League's Cincinnati Reds to the 1975 and 1976 championships, then added a third title in 1984 with the Detroit Tigers of the American League. Anderson also earned the nickname "Captain Hook" because of his tendency to pull underperforming pitchers early in the game. While playing for Fort Worth in 1955, his nickname Sparky was bestowed upon him by the team's radio announcer, who noted Anderson's on-field feistiness.

https://en.wikipedia.org/wiki/Sparky_Anderson

Other people nicknamed Sparky include:

• Earl John "Sparky" Adams, a Major League Baseball player.
  
• Albert Walter "Sparky" Lyle, a Major League Baseball pitcher.
  
• Charles Schulz, the creator of the Peanuts comic strip.
  
• Mark "Sparky" Hughes, a Welsh football (soccer) player, now manager of Blackburn Rovers.
  
• "Sparky" Danny H Simmons Jr, Lead Guitarist and Founding member of the psychadelic rock band Acid FM.

https://en.wikipedia.org/wiki/Sparky