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Cognomen איסאק (Isac , איסאק , Isaác ) , in all the world, is a common surname. The family name איסאק is habitual in Moldova, where it is quite a common surname, Romania, and United Arab Emirates, where it is quite a rare surname. Measured by absolute frequency, it is commonest in Romania, Mexico, and India. More frequently, איסאק is the forename as well as the last name.