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.

Kaitlin Olson says her kids are "really not happy" about their dad Rob McElhenney changing his name. The 'It's Always Sunny in Philadelphia' actor filed to legally change his name on June 26.