Antarctic Ocean : The Antarctic Ocean, also known as the Southern Ocean, is defined in opposition to the Arctic : Antarctic simply means ‘opposite to the Arctic’.
Arctic Ocean : The Arctic is a polar region located at the northernmost part of Earth. The word Arctic comes from the Greek word arktikos, “near the Bear, northern” and that from the word arktos, meaning bear.
Atlantic Ocean : Its name refers to Atlas of Greek mythology, making the Atlantic the “Sea of Atlas“. The oldest known mention of “Atlantic” is in The Histories of Herodotus around 450 BC.
Indian Ocean : It is named simply because it is to the south of India.
Pacific Ocean : Portuguese explorer Ferdinand Magellan sailed the Pacific on a Castilian (Spanish) expedition of world circumnavigation starting in 1519. Magellan called the ocean Pacífic meaning “peaceful” because, after sailing through the stormy seas off Cape Horn, the expedition found calm waters.