When famous Ohioan, Civil War general, and really terrible president Ulysses S. Grant was born, he was actually named Hiram Ulysses Grant. But upon entering West Point, the admissions office used the name that the congressman had accidentally written on his letter of recommendation, and U.S. Grant was born. His friends at West Point called him Sam, after Uncle Sam, but he'd get an even cooler moniker during the Civil War when he demanded (and won) the unconditional surrender of Fort Donelson and became "Unconditional Surrender" Grant.
I bring all of this up because J.T. Barrett has a ready made nickname that came about as a result of being near-automatic in the red zone in the past few games.