Source : Webster's Revised Unabridged Dictionary (1913)

Johnny \John"ny\, n.; pl. {Johnnies}.
   1. A familiar diminutive of {John}.

   2. (Zo["o]l.) A sculpin. [Local cant]

   {Johny Crapaud}, a jocose designation of a Frenchman, or of
      the French people, collectively.

Source : WordNet®

Johnny
     n : `johnny' was applied as a nickname for Confederate soldiers
         by the Federal soldiers in the American Civil War;
         `grayback' derived from their gray Confederate uniforms
         [syn: {Rebel}, {Reb}, {Johnny Reb}, {grayback}]