그 당시에는 길이 구불구불한 골짜기란 뜻에서 서리골이라 하였는데, 한자로 표기하는 과정에 반곡(盤谷)이 되었다고 한다.
At that time, it was called Seorigol, meaning a valley with a winding road, and it was said that it became Bangok in the process of writing in Chinese characters.