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Surname Sadai (Sadai , Садай , Садаи ) , globally, is quite a rare family name. The family name Sadai is characteristic of Qatar, where it is quite a rare surname, Nepal, where it is a rare surname, and Saudi Arabia. Measured by absolute frequency, the name is most common in India, Nepal, and Saudi Arabia. More prevalently, Sadai is the forename as well as the last name.