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 ...

Kaitlin Olson reacted to her husband, Rob McElhenney, changing his name to Rob Mac during an interview with PEOPLE at the 'It ...