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Across the world, Sincere (Sincere , จริงใจ ) is quite a rare epicene given name. The forename Sincere is characteristic of the Democratic Republic of the Congo, where it is quite a rare gender-neutral name, Hong Kong, where it is a rare female name, and Thailand, where it is a rare epicene name. In absolute terms, it is the most numerous in the Democratic Republic of the Congo, Thailand, and the United States. Much less frequently, Sincere is the last name as well as the forename.