 It was Mike Farrell (I) (qv) who asked to have his characters  daughters name be Erin, after his own daughter of the same name. It  was originally going to be Melissa. Every time B.J. Hunnicut talks  into a phone, on screen, he was really talking to his wife at the  time, Judy, or his daughter, Erin. As well, anytime B.J. mentioned  his daughter Erin, Farrell was speaking from the heart about his  real life daughter.