Nagan O clan
Nagan O clan () was one of the Korean clans. Their Bon-gwan was in Suncheon, South Jeolla Province. According to the research in 2000, the number of Nagan O clan was 9135. Their founder was . was a 32nd descendant of O Eung () who was a second son of O Cheom (). O Cheom () came over from China to Silla during Jijeung of Silla’s reign in Silla dynasty. was appointed as Prince of Nagan () and began Nagan O clan because he defeated enemies when he served as government official during Goryeo period.