It is difficult to determine the name of the Earth’s first ship powered by buoyancy, as the exact origins of buoyancy-powered boats are not well-documented. However, it is likely that some of the earliest boats and rafts ever built by humans were powered by buoyancy, which is the upward force that allows objects to float in a fluid (like water).
One of the earliest known examples of a buoyancy-powered boat is the Egyptian Khufu ship, which was built around 2500 BCE and discovered near the Great Pyramid of Giza in the 1950s. The Khufu ship was made of cedar wood and was likely powered by a combination of wind and oars, as well as by the natural buoyancy of the water it floated on.
Other early examples of buoyancy-powered boats include the reed boats used by ancient civilizations in Egypt, Mesopotamia, and South America, which were made by weaving together bundles of reeds or grasses into a watertight structure.
Overall, while we may not know the exact name of the Earth’s first buoyancy-powered ship, we can see that buoyancy has been used as a fundamental principle for boat design and propulsion for thousands of years.