Icheon Seo clan () is one of the Korean clans. Their Bon-gwan is in Icheon, Gyeonggi Province. According to the research held in 2015, the number of Icheon Seo clan was 199792. Their founder was who was a descendant of King Jun of Gojoseon, the Gija JoseonâÂÂs last king. He lived at seoaseong () in Icheon. He named their surname after the name of the place âÂÂIcheonâÂÂ.