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Cognomen Issai (ישי , Issai , Иссаи ) , globally, is quite a rare surname. The family name Issai is habitual in Israel, where it is quite a rare surname, Oman, where it is a rare surname, and Tanzania. Measured by absolute frequency, the name is most common in Israel, Mexico, and Tanzania. Likewise, Issai is the forename as well as the last name.