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Family name Cavallo (Cavallo , Kavalo , Kawall ) , in all the world, is a common surname. The surname Cavallo is characteristic of Italy, where it is quite a common surname, Argentina, where it is quite a rare surname, and Uruguay. Measured by absolute frequency, it is commonest in Italy, Argentina, and the United States. Very seldom, Cavallo is the forename as well as the last name.