Problem of and try to rename the correct given name Mitch

https://contribute.imdb.com/contribution/260130-231612-194000/?ref_=ra_his_wa

I tried to make a correct name of the Olympic Champion, Gymnastics, 1984 Mitch Gaylord. Mitchell can never be used in the first name. And I need help. His birth name is Mitchell Jay Gaylord. Mitchell Gaylord has to change for an update into the right given name. Mitch. Not Mitchell.