新安県
The town is named after Sai Kung (). Which the name was appeared in the Western publications dated back to the early 1900s, but only stated as "the village of Sai Kung". Sai Kung also probably first appeared on the map of the Xin'an County, made by Simeone Volonteri in 1866. The origins of the name Sai Kung is unknown. Moreover, there are criticisms on the accuracy of Volonteri's map in general, or for specific place name such as "Green Hill", which historically known as Tuen Mun Hill.