Specifically, that It’s Always Sunny In Philadelphia and Mythic Quest co-creator Rob McElhenney had filed paperwork to legally change his name to “Rob Mac,” acting on a re-branding he’d floated a few weeks earlier in a Variety profile of himself and wife Kaitlin Olson.

Rob McElhenney opened up about changing his name to 'Rob Mac' at the 'It’s Always Sunny in Philadelphia' 20th Anniversary Celebration on Tuesday, July 1, saying that his family name has changed 'six or seven' times in the past,

"It's Always Sunny in Philadelphia" creator and star Rob McElhenney is changing his legal name to Rob Mac, and he took to Instagram to explain why.