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Last name Ratt (Rath , Ratti , Rat ) , all over the world, is a widespread cognomen. The surname Ratt is characteristic of Seychelles, where it is a common surname, Austria, where it is quite a common surname, and Italy (explore the name in all countries). Measured by absolute frequency, this name is the most popular in India, Germany, and Italy. Much less frequently, Ratt is the forename as well as the last name.