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Surname Langquan (Langquan ) , all over the world, is an extremely rare last name. Much more frequently, Langquan is the forename as well as the last name.
朗全, 朗劝, 朗权, 朗泉, 朗铨, 浪全, 浪权, 浪泉, 浪犬, 狼犬, 琅全, 琅权, 琅泉, 琅铨, 郎泉, and 郎犬
Lin, Tan, and Zhang