Whats the name of the most popular white wine in the world?

The most popular white wine in the world is Riesling.

Riesling is a white grape variety that is native to Germany and Austria. It is known for its high acidity and low sugar content, which give it a refreshing and slightly tart taste. Riesling is often used in dry white wines, such as Riesling Spätlese, which are characterized by their crisp, refreshing flavor.