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Family name Sinyan (Sinyan , ซินหยาน ) , around the world, is a rare last name. The surname Sinyan is characteristic of Gambia, where it is quite a rare surname, Taiwan, where it is a rare surname, and Ireland. In absolute terms, it is commonest in Gambia, Taiwan, and the United States. Much less frequently, Sinyan is the forename as well as the last name.