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Cognomen Sinchun (Sinchun ) , in all the world, is an extremely rare surname. Much more prevalently, Sinchun is the forename as well as the last name.
Синхун, Синчунь, Синьхун, Сіньхун, シンチュン, 辛春, 辛淳, 辛纯, and 辛醇
Hwang