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Across the world, Sinthia (Sinthia ) is quite a common girly first name. The first name Sinthia is habitual in Bangladesh, where it is quite a rare primarily girly, but very seldom male name, the Dominican Republic, where it is quite a rare feminine name, and Uruguay. In absolute terms, it is the most numerous in Bangladesh, Indonesia, and Brazil. Very seldom, Sinthia is the last name as well as the forename.