It comes from Atlas, son of Neptune, the god of the seas.
The Spanish discoverer of the Pacific, Vasco Nuñez de Balboa, had named it the Southern Ocean. But in 1520, when the Portuguese navigator Fernão de Magalhães traveled along the South American coast, he was struck by the tranquility of the waters and named the ocean of Pacific. In fact, the day was atypical because the Pacific is more dangerous than the Atlantic.
It was named after the shores of India and Indonesia.
Situated at the north pole, under the constellation Ursa Minor, it owes its name to the Greek word arctos, meaning bear. By geographical opposition, the ocean of the south pole is called Antarctic.