Rob McElhenney is legally changing his name to “Rob Mac” despite Ryan Reynolds creating a tune on how to correctly pronounce his last name. As for how Kaitlin Olson feels? Read on to see.

The star of "It's Always Sunny in Philadelphia" and co-creator of "Welcome to Wrexham" said too many people were mispronouncing his name.

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.