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.

The 'It's Always Sunny in Philadelphia' actor and creator's new name already appears in FX's official materials for the long-running sitcom

Rob McElhenney has had much success in TV under that name. McElhenney, co-creator of the long-running comedy series “ It’s Always Sunny in Philadelphia ,” has filed for a legal name change. McElhenney is known to fans of the FXX show as Mac (a character born Ronald McDonald ), so it’s not a long ways off from that.