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Last name Ishai (ישי , Ishai , Ишай ) , in the world, is quite a rare cognomen. The family name Ishai is characteristic of Western Asia, particularly Israel, where it is quite a rare surname, Cyprus, and Georgia, where it is a very rare surname. Measured by absolute frequency, it most frequently occurs in Israel, India, and Nigeria. Also, Ishai is the forename as well as the last name.