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Family name Jac (Jack , Jac , ジャック ) , in the entire world, is a widespread cognomen. The last name Jac is characteristic of Saint Vincent and the Grenadines, where it is a widespread surname, Marshall Islands, where it is a common surname, and Trinidad and Tobago (explore the name in all countries). In absolute terms, it is the most numerous in Indonesia, Myanmar, and the United States. More prevalently, Jac is the forename as well as the last name.