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Surname Thavan (ถวัลย์ , Thavan ) , in all the world, is a rare family name. The last name Thavan is characteristic of Malaysia, where it is a rare surname, Singapore, where it is a very rare surname, and India. In absolute terms, it most frequently occurs in India, Malaysia, and South Africa. Much more prevalently, Thavan is the forename as well as the last name.