Why it called Gu lang yu island in China?

During the Ming Dynasty (1368-1644), the island was called 'Yuanshazhou Island'. It got its present name from the huge reef surrounding it. When the tide comes in, the waves pound the reef and it sounds like the beating of a drum. The island came to be named 'Gulang'. Gu in Chinese means 'drum', and Lang, 'waves'.
During the later Ming Dynasty, the troops of national hero Zheng Chenggong were stationed here. After the Opium War in 1842, 13 countries including Great Britain, France and Japan established consulates, churches, and hospitals, turning the island into a common concession. In 1942, Japan occupied the island until the end of the War of Resistance against Japan.