Premise: The Game Plan is a 2007 American family comedy film directed by Andy Fickman and written by Nichole Millard, Kathryn Price and Audrey Wells and starring Dwayne "The Rock" Johnson (marking the last film in which Johnson uses his ring name "The Rock" in billing). It follows an NFL quarterback who finds out he has an 8-year-old daughter from a previous relationship.
Hypothesis: Dwayne Johnson retired the name The Rock in billing after filming the movie The Game Plan