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.

Rob McElhenney has seen the online discourse around his name change and is chiming in. The Emmy winner, who made headlines for filing to legally change his name to Rob Mac last week, took to social media to “dedicate exactly one minute” to explaining why he took such significant measures.

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.