Which planet is named after the Greek god who personified the sky?

The correct answer is Uranus, which is named after the ancient Greek god of the sky, Ouranos. In mythology, Uranus is often depicted as the personification of the heavens and is associated with the primordial entity that represents the sky. This name reflects the planet's distant, expansive nature and its position in the solar system, which is far from the Earth and the inner planets.

In contrast, the other planets listed have names derived from different figures in mythology. Neptune is named after the Roman god of the sea, Saturn after the Roman god of agriculture and wealth, and Jupiter after the king of the Roman gods. Each of these names evokes attributes or domains associated with the respective deities rather than the sky itself, making Uranus the accurate choice for a planet named specifically after the Greek personification of the sky.