Answer
Hong Taiji, the second emperor of the Qing dynasty, played a pivotal role in shifting the identity of his people. In 1635, he officially changed the name of the Jurchen ethnicity to "Manchu," marking a significant moment in Qing history. This act symbolized their transition from a tribal identity to a unified Manchu nation, setting the stage for their future conquests and the establishment of the Qing dynasty.