The 26-year-old man told friends that if his beloved team didn't win the Super Bowl, he'd become Peyton Manning after the Indianapolis Colts star quarterback.
Wiese calls himself a die-hard Bears fan and has said the name change represents that passion.
But Macon County Circuit Judge Katherine McCarthy says the name change is too confusing and risks infringing the privacy of the football player.
Wiese says he told the judge he wasn't changing his name because he wanted to do, but because he was honoring a bet.
Wiese says there'll be no appeal to the judge's decision.