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Cognomen Jacoby (Jacoby , Якоби , جاكوبي) , worldwide, is a common family name. The cognomen Jacoby is characteristic of Israel, where it is quite a common surname, Luxembourg, and Guadeloupe. Not in comparison with a country's population, it is the most numerous in the United States, Israel, and Germany. Very seldom, Jacoby is the forename as well as the last name.