Why is it called golden gate Bridge.

To add to Wanda, the explorer named it Chrysopolae (Golden Gate) because of its similarity to the harbor of Byzantium (modern-day Istanbul), dubbed Chrysoceras (Golden Horn). Src: http://goldengatebridge.org/research/FactFiction.php

The Bridge is actually named for the Golden Gate Strait, the narrow entrance between the Pacific Ocean and the San Francisco Bay. The strait was named by explorer and U.S. Army officer John C. Frémont, who marveled at its beauty in 1846—two years before the discovery of gold in California.