배에 까치들이 울며 따라왔으므로 '까치 작(鵲)'에서 '새 조(鳥)'자를 떼서 '석(昔)'으로 성을 삼았다.
Since crying magpies followed the ship, they gave the surname Seok by combining the Chinese characters of Jak from the meaning "magpies" and Jo from the meaning "bird."