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Family name Avishai (אבישי , Avishai , Авишай ) , worldwide, is a rare surname. The cognomen Avishai is characteristic of Israel, where it is quite a rare surname, Bulgaria, where it is a rare surname, and Georgia, where it is a very rare surname. In absolute terms, it is the most numerous in Israel, the United States, and Bulgaria. More prevalently, Avishai is the forename as well as the last name.