That's Rob Mac to you.It's Always Sunny in Philadelphia star Rob McElhenney knows you think it's "kinda douchey" for him to change his name to Rob Mac, but here's the thing — he doesn't really care.The actor took to social media Tuesday to explain his decision in a characteristically comical video captioned simply,

Call him an actor, writer, producer, director, Welsh soccer-team owner and creator of "It's Always Sunny in Philadelphia" – just don't call him Rob McElhenney. It's Rob Mac now.

Rob McElhenney has filed legal documents to change his name. The actor reportedly signed the docs Thursday requesting that his surname be changed to Mac - so his new name will be Rob Mac, according to multiple outlets.