What is "dequey"

Dequey is one of the Batanes Islands, in the province of Batanes, in Luzon Strait, the Philippines. The island is a very small and a rather low piece of land, lying nearly 1/2 mile westward of the northwest point of Ivuhos Island. Dequey Island is uninhabited.

An unnamed active submarine volcano rising to within of the sea surface is located due west of Dequey Island.