The alter ego in the title I Am... Sasha Fierce is Sasha Fierce.
Beyoncé released I Am... Sasha Fierce on November 12, 2008. The album was presented as a double-disc project: I Am contained more personal, introspective songs, while Sasha Fierce emphasized energetic performance music and a bold stage persona.
Beyoncé described Sasha Fierce as an alter ego she used while performing. The concept helped frame the contrast between her private identity and the confident, theatrical character associated with major stage productions. The album included “If I Were a Boy,” “Halo,” “Single Ladies (Put a Ring on It),” and “Diva.”
Sasha Fierce is not Beyoncé’s legal name, and it is not the same as “Yoncé,” a nickname later used in her music. Beyoncé eventually said that she no longer needed the alter ego because she had integrated the confidence it represented into her own identity. The album title therefore refers to a deliberate performance concept rather than a separate artist.