In the 17th century the village formed the boundary between Mumbai and Salsette Island.

The name remained even after Mumbai was joined to the Salsette and extended up to Mulund.

In 1543, the Portuguese took possession of the largely uninhabited islands of Bombay, naming it Sião, after a biblical hill in Israel.

The Jesuits then built a chapel on the hill near the present-day railway station and named it after Mount Zion (Sion) in Jerusalem.

[citation needed] Sion is also a home to many educational institutes, including: