Gochang O clan () was one of the Korean clans. Their Bon-gwan was in Gochang County, North Jeolla Province. According to the research in 2000, the number of Gochang O clan was 16716. Their founder was O Hak rin (). He was a Hanlin Academy during Jeongjong, 10th monarch of Goryeo’s reign in Goryeo dynasty and a descendant of O Cheom () who came over from China to Silla during Jijeung of Silla’s reign in Silla dynasty.
See also Korean clan names of foreign origin
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