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Surname Ratti (Ratti
, Ratt
, Tratt
) , in the entire world, is a common cognomen. The surname Ratti is habitual in Italy, where it is quite a common surname, Paraguay, and Estonia, where it is quite a rare surname. In absolute terms, it is the most numerous in Italy, India, and Argentina. Also, Ratti is the forename as well as the last name.