Etymology of "Merlyn LeRoy"

"Merlyn LeRoy" is from the Rocky & Bullwinkle Show. It's used a couple of times for the name of a wizard in Fractured Fairytales; the name is a pun on Mervyn LeRoy, a well-known movie director/producer ( Little Caesar, the Wizard of Oz, etc). I've used "Merlyn LeRoy" as a nom-de-net since the early 1980s; hardly anyone ever gets the pun...