The real Saint Nikolas was in the Netherlands. His wife would have called him Nikolas or in her own language possibly an endearing term like dear, husband, Nick or sweetie.
Ms. Claus gives Santa presents.
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.
Santa Claus