Beyoncé’s alter ego during the I Am... Sasha Fierce era was called Sasha Fierce.
The concept shaped her 2008 double album I Am... Sasha Fierce, whose two discs were presented as contrasting sides of her artistic identity. The “I Am” disc emphasized more personal and introspective material, while the “Sasha Fierce” disc focused on stronger dance, performance, and stage-oriented songs.
Beyoncé described Sasha Fierce as a persona that emerged in performance, helping her separate private life from the confidence and intensity required onstage. The name became especially associated with songs such as “Single Ladies (Put a Ring on It)” and “Diva.”
Yoncé is another nickname used in Beyoncé’s music, but it is not the alter ego named in the album title. Foxxy Cleopatra is the character she played in Austin Powers in Goldmember, while Queen B is a fan and media nickname rather than the album’s formal persona.