Majin Buu (魔人ブウ, Majin Bū; lit. "Majin Boo"), later known as Mr. Buu (ミスター・ブウ, Misutā Buu; lit. "Mister Boo"). Majin Buu takes many forms, and all of the forms are simply referred to as "Majin Buu" in the series, but the various forms get their common names from various Dragon Ball Z video games.
Buu's along with Bibidi and Babidi's names are most likely references to the magic words the fairy godmother uses in the 1950 film Cinderella."