The surprise winner of this year's Australian Open has even gone as far as to inform the ATP Tour that that is how he should be referred to in their documents.
Asked ahead of the French Open, which starts in Paris on Sunday, why he had ditched the "islas", he replied: "Because everybody called me Stan — no kidding.
"It's just to simplify everything on the draw, my name during press conferences," Wawrinka said.
"That's the only reason," he said.
"Of course I'm Stan Wawrinka," Wawrinka said.
"That's all right — Andy (Murray) did it as well," he said.
"It's to simplify the whole thing, that's all. Nothing important."
Wawrinka — the family name is of Polish descent — has Czech grandparents, while his father Wolfram is German and his mother Isabelle Swiss.
He was born in the Swiss town of Lausanne, headquarters to the International Olympic Committee (IOC).