How did the name Denton True Young get shortened to Cy Young?

Denton True Young, one of baseball's greatest pitchers, was born on this date in 1867. His fastball was so powerful that a friend dubbed him "Cyclone." It was shortened to "Cy" and the name stuck. Young still holds records for most major-league wins (511), most games started and most innings pitched. He pitched so many games that he also holds the records for most losses (316). Young pitched the American League's first perfect game in 1904; in his career he pitched three no-hitters. The award for major league baseball's best pitcher of the year, the Cy Young Award, is named in his honor.