Rob McElhenney, soon to be known as Rob Mac, is defending the decision to change his last name. In a recent post on X, McElhenney shared a brief video explaining why he abridged his last name for those still scratching their heads over the news.

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.