People in Antactica all came there from other countries, and they would call Santa whatever they call him in their native languages.
The Kikuyu people in Kenya don't all believe in Santa Claus, but the ones who do usually call him Father Christmas, Santa Claus, Sinterklaas, or Papa Noël. The word "Santa" has been adopted into many native languages as is.
Santa Claus
Santa Claus
In Thai, Santa Claus is ซานตาคลอส.
They call him Santa Claus, or Santa.
We canadians call him Santa Claus, also. Don't worry about it.
They call him Santa Claus. Exactly the same name as you call him.
Santa Claus, or Father Christmas.
He is still called Santa Claus there, in Alaska.
People in Pakistan call Santa Claus Baba Christmas
People in England often call him Father Christmas, but some of them call him Santa Claus as well.