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Surname Sinai (Sinai
, סיני
, Синаи
) , around the world, is quite a common last name. The surname Sinai is characteristic of Israel, where it is quite a common surname, Papua New Guinea, where it is quite a rare surname, and Mexico. Measured by absolute frequency, it is commonest in Mexico, Israel, and Egypt. Likewise, Sinai is the forename as well as the last name.