Originally Posted by Mustard
They probably also preferred "Ricardo" instead of "Richard".
Ricardo Gonzalez belongs to his family, but Pancho Gonzales, the moniker the man himself used on his autobiography, belongs to history.
The distinction is easy. Use "Ricardo Gonzalez" when contacting his family (or himself in his later years), and "Pancho Gonzales" when discussing tennis history.
Arthur Ashe was a personal friend of Gonzales, and even took excursions with him. He always called him "Richard", never "Pancho", although most in the 1950's, including his friends, used "Pancho" when talking with Gonzales, and "Segoo" for Segura.