How to change the name of the doll in Sackboy's Adventures

Cannot be changed. According to information on the official website of the Sackboy Adventure game, Sackboy Adventure cannot change the doll's name. "Sackboy Adventure" is a 3D platform jumping game produced by SumoDigital. As the name of the game says, players will play the role of a "Sackboy". And avoid enemies by jumping, running, attacking, etc.