How did frank Sinatra get his many nicknames?

When Frank Sinatra was a bachelor in his 40's, he entered a middle-aged crazy phase, cavorting in Las Vegas, Atlantic City, Hollywood and stops in between. His entourage, nicknamed 'The Rat Pack', included Sammy Davis Jr., Dean Martin, Peter Lawford, Joey Bishop and Shirley MacLaine, who called Sinatra "Chairman of the Board".

Sinatra was known by three nicknames:

Ol' Blue Eyes, for his bright azure eyes;

Chairman of the Board, for his lofty status in the entertainment world;

and The Voice, a term shortened by a reporter from a talent agent's proposed The Voice That Thrilled Millions.