desilu-playhouse:

Lucy, Desi and Desi Jr. visiting the Dallas Forth-Worth area in February 1956.

She said, ‘I want you to have an ‘A-R’ in your name.’ I said, ‘A-R?’ She said, ‘Yes, that’s my good luck.’ I said, ‘You haven’t done badly with Lucille Ball.’ ‘I didn’t hit it big until I changed it to Arnaz.’