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.

It’s Always Sunny in Philadelphia star Rob McElhenney is legally changing his name to “Rob Mac.” The actor, who filed the legal documents in Los Angeles last week, had been considering the change for some time,