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.

I realized that it was just a series of letters and syllables that was smacked together by some government official in the late 1800s," the actor tells PEOPLE

"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.