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Surname Onchi (Onchi
) , all over the world, is a rare cognomen. The last name Onchi is characteristic of Latin America and the Caribbean, particularly Mexico, where it is a rare surname, Peru, and Venezuela, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in Mexico, the United States, and Peru. Also, Onchi is the forename as well as the last name.