This is just something I thought of today. And I have one which I'll post. And I bet there's others but I can't think of any more at the moment but I'm sure I will. And I'm wondering if anybody else can come up with some.

The one I thought of today is Gavin Macleod. He played Murray Slaughter on The Mary Tyler Moore Show and then Merrill Stubing on The Love Boat. Both characters initials are M.S. I don't know why that popped into my head today but I thought it would make for an interesting discussion.

Ed. ETA: I just wanted to clarify I wanted to primarily discuss actors/actresses and their roles on sitcoms. But we can include actors in dramas too.

A few come to mind from long ago and far away:

Lucy Carmichael, Lucy Carter (The Lucy Show, Here's Lucy)

Bob Collins, Bob Carson (Love That Bob, The New Bob Cummings Show)

Andy Taylor, Andy Thompson (The Andy Griffith Show, Headmaster)