Beyoncé used the stage persona Sasha Fierce on I Am... Sasha Fierce.
Released in 2008, the double album was divided into two discs: I Am..., which presented more vulnerable and personal material, and Sasha Fierce, which emphasized a bolder performance identity. Beyoncé described Sasha Fierce as an alter ego associated with her stage confidence and theatrical energy.
The album produced major singles including “If I Were a Boy,” “Single Ladies (Put a Ring on It),” “Halo,” and “Diva.” “Single Ladies” became particularly influential because of its striking black-and-white video and tightly synchronized choreography.
Sasha Fierce was not Beyoncé’s legal name or a separate recording artist. She later said she had retired the persona, explaining that she no longer needed an alter ego to access confidence in performance. Yoncé is a separate nickname associated with Beyoncé, not the persona named in this album title.