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Surname Jaca (Jack , Jaca , Hack ) , globally, is a widespread last name. The family name Jaca 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). Measured by absolute frequency, this name is the most popular in the United States, Indonesia, and Myanmar. More prevalently, Jaca is the forename as well as the last name.