Rob McElhenney’s new last name has high potential. But for his wife and “It’s Always Sunny in Philadelphia” co-star, Kaitlin Olson, she isn’t fazed by the switch-up from McElhenney to “Mac.” The actor filed to legally change his name last week and is waiting for the court to make it official.

Rob McElhenney isn’t making any apologies over his decision to change his name, but he is making a few jokes about it. The “It’s Always Sunny in Philadelphia” star addressed the move amid reports he has filed paperwork to change his name.

Call him an actor, writer, producer, director, Welsh soccer-team owner and creator of "It's Always Sunny in Philadelphia" – just don't call him Rob McElhenney.