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Surname Moroi (Moroi , Морой , Морои ) , in the entire world, is quite a rare last name. The cognomen Moroi is characteristic of Moldova, where it is quite a common surname, Romania, where it is quite a rare surname, and Kazakhstan, where it is a rare surname. Measured by absolute frequency, it is commonest in Eastern Europe, particularly Moldova, Romania, and Russia. Much less frequently, Moroi is the forename as well as the last name.