The nickname for John is Jack, actually. Jack and Dick both belong to a class of nicknames that all end in "ck" or "k" sounds, but for which the original doesn'

The nickname for John is Jack, actually. Jack and Dick both belong to a class of nicknames that all end in "ck" or "k" sounds, but for which the original doesn't have a k sound. * Jack * Dick * Rock from Roland * Hank from Henry * Chuck from Charles