Beyoncé’s alter ego introduced during the I Am... Sasha Fierce era was Sasha Fierce.
The name became especially prominent with the 2008 album I Am... Sasha Fierce, which was structured as two discs. The “I Am...” disc emphasized more personal and reflective songs, while the “Sasha Fierce” disc presented a bolder, more performance-oriented persona.
Beyoncé described Sasha Fierce as a stage identity that helped her become more uninhibited during performances. The concept was connected to the album’s contrast between vulnerability and theatrical confidence.
The album included “If I Were a Boy,” “Halo,” and “Single Ladies (Put a Ring on It).” “Queen B” and “Yoncé” are nicknames associated with Beyoncé, but they are not the alter-ego name specifically linked to this album era.