Beyoncé used the name Sasha Fierce for her onstage alter ego during her early solo career.
She described Sasha Fierce as a more confident, sensual, and uninhibited performance persona. The concept became especially prominent in connection with her 2008 third studio album, I Am... Sasha Fierce, which was divided into two discs representing contrasting sides of her artistic identity.
The “I Am...” disc emphasized more intimate and introspective material, while the “Sasha Fierce” disc focused on energetic, dance-oriented songs. Singles associated with the project included “If I Were a Boy,” “Single Ladies (Put a Ring on It),” and “Halo.”
Beyoncé later said that she no longer needed to separate Sasha Fierce from her everyday identity, explaining that the persona had helped her become more confident onstage. Sasha Fierce is therefore the canonical alter-ego name, not a formal legal name or permanent group identity.