Wiese calls himself a die-hard Bears fan and has said the name change represents that passion.
But Macon County Circuit Judge Katherine McCarthy said the name change is too confusing and risks infringing the privacy of the football player.
Wiese said he told the judge he wasn't changing his name because he wanted to do, but because he was honoring a bet.
Wiese said there'll be no appeal to the judge's decision.
Forsyth is about seven miles north of Decatur.