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Last name Rabai (Rabai , ระบาย , Рабай ) , all over the world, is quite a rare family name. The family name Rabai is characteristic of Hungary, where it is quite a common surname, Botswana, where it is quite a rare surname, and Tunisia. Measured by absolute frequency, the name is most common in Hungary, Algeria, and Morocco. Likewise, Rabai is the forename as well as the last name.