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Family name ינאי (Yanay , Yanai , Yannai ) , all over the world, is quite a rare last name. The cognomen ינאי is habitual in Israel, where it is quite a common surname, Hong Kong, where it is quite a rare surname, and Hungary, where it is a rare surname. Measured by absolute frequency, it is commonest in Israel, Japan, and Brazil. Also, ינאי is the forename as well as the last name.