There is an episode of To Tell the Truth where at the end, one of the fakers introduces himself as "Roger Von Ost, and I'm in the insurance business." Bud Collyer cocks his head to one side, as if trying to calculate why this name sounds so familiar.
Bud Collyer: "'Von Ost' did you say?"
Bud: "Well isn't there a a, am I wrong, isn't there a famous name in show business? A"
Roger: "He changed it."
Bud: "Henry Morgan!"
Roger: "That's right, he's my brother."
Bud: "Your brother! Henry Morgan's brother!"