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Globally, Alonzo (Alonzo , Алонсо , אלונזו ) is a common boy's first name. The forename Alonzo is habitual in Bahamas, where it is quite a rare masculine name, Guatemala, and the United States. Measured by absolute frequency, it is the most numerous in the United States, Mexico, and Philippines. More frequently, Alonzo is the last name as well as the forename.
Alonzo is also a name for the fictitious and mythical characters: Alonso Quijano , the protagonist of Don Quixote; Alonzo Harris , the character in the film Training Day; Alonzo Hawk , the character from The Absent Minded Professor, The Absent-Minded Professor; Alonzo Torquemada , character in Oz and Alonzo , the character in the musical "Cats", among other works.