People in Antactica all came there from other countries, and they would call Santa whatever they call him in their native languages.
People in Ireland call him Santy, Santa and Santa Claus. Santa Claus comes from Saint Nicholas and can then be shortened to Santa Claus or just Santa or Santy. So people in Ireland use those names, like people in many countries do.
Because Antarctica has no permanent resident population and belongs to no single nation, it would depend which base you were on. The Australian and UK bases would call him Father Christmas, and the US bases would call him Santa Claus.
We canadians call him Santa Claus, also. Don't worry about it.
Santa Claus
They call him Santa Claus. Exactly the same name as you call him.
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.
They call him Santakukoru.
I don't know, what do people in Madagascar call Santa Clause?
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Julemanden.
聖誕老人 that is how you call santa