용계동은 1914년 행정구역 폐합 때 병합된 구룡동과 금계동에서 한 글자씩 따서 용계동이라 하였다 한다.
Yonggye-dong is said to be Yonggye-dong after one letter from Guryong-dong and Geumgye-dong, which were merged when the administrative district was closed in 1914.