What was Beyoncé’s stage alter ego named in the title of her 2008 double album?

Beyoncé’s stage alter ego named in her 2008 double album was Sasha Fierce.

The album I Am... Sasha Fierce was released on November 12, 2008. Its two discs were designed to contrast Beyoncé’s personal and performance identities. The “I Am...” disc emphasized more intimate ballads, while the “Sasha Fierce” disc focused on energetic, assertive performance songs.

Beyoncé described Sasha Fierce as a persona she used when performing. She later said that the character helped her separate her public stage confidence from her private self. The concept became closely associated with songs such as “Single Ladies (Put a Ring on It)” and “Diva.”

Sasha Fierce is not Beyoncé’s birth name, a formal band name, or the title of a separate person’s project. It is the alter ego presented through the album’s title and its visual and musical concept. The album became her third number-one album on the Billboard 200.