What name did Beyoncé use for her onstage alter ego in the late 2000s?

Beyoncé used the name Sasha Fierce for her onstage alter ego in the late 2000s. The persona became central to her 2008 double album I Am... Sasha Fierce.

Beyoncé described Sasha Fierce as a more confident, sensual, and uninhibited performance identity. The album’s first disc, I Am..., emphasized personal and emotional material, while the Sasha Fierce disc focused more heavily on energetic performance songs.

The project produced hits including “Single Ladies (Put a Ring on It),” “If I Were a Boy,” “Halo,” and “Diva.” The contrast between the two discs helped frame different sides of Beyoncé’s public artistry.

The name is not Beyoncé’s legal name or a separate recording artist. She later said she had retired the alter ego, explaining that she had grown comfortable expressing those qualities as herself.