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Last name Doujian (Doujian ) , in all the world, is an extremely rare cognomen. Much more prevalently, Doujian is the forename as well as the last name.
兜健, 兜囝, 斗健, 斗剑, 斗建, 斗见, 痘健, 豆尖, 都健, 都坚, and 都建
Chu, and Song