Rob McElhenney has chosen to go by Rob Mac publicly, and Kaitlin Olson reveals how she feels about this change.

Rob McElhenney’s new last name has high potential. But for his wife and “It’s Always Sunny in Philadelphia” co-star, Kaitlin ...

"I'm legally Olson McElhenney, but I go by Olson, so I don't really have to change anything," she tells PEOPLE of her husband changing his name from Rob McElhenney to Rob Mac ...