The Spaniard Gabriel de Castilla, who claimed having sighted "snow-covered mountains" beyond the 64° S in 1603, is recognized as the first explorer that discovered the continent of Antarctica, although he was ignored in his time.
Captain James cook
He was a British Navy Officer and two-time Antarctic Explorer.
Russian explorer Fabian Gottlieb was the first to sight the Antarctic continent, in 1820. He did not land there, and it was almost another century before a landing was made.
George Washington was an explorer. In fact, George Washington DeLong was an Antarctic explorer. George Washington Jr. was a sailor and an Antarctic explorer as well.
James Cook
James Cook
The explorer is Ann Bancroft.
Peary is not an Antarctic explorer: he focused on the Arctic.
The Antarctic sea is not named after an explorer, but after the continent it is near to; also Antarctica was not named after anyone, but was named because of where it was. It is on the opposite side of the Arctic, so they combined anti- and Arctic( which means cold,that is how the Arctic got its name) and created Antarctic.
Antarctic Explorer
Mawson was Australia's most famous explorer
According to the Wikipedia page that lists Antarctic expeditions in the 20th century, one is listed for 1993: "1992-1993 - Antarctic Environmental Research Expedition - led by Kenji Yoshikawa." It is unclear which member of this expedition is considered the 'first'.