Most European wines are named after their geographical origin. One very famous example would be the Bordeaux wine which is produced in the Bordeaux region of France. Bordeaux wines are made of Cabernet Sauvignon, Merlot, Cabernet Franc, Petit Verdot, and to a much lesser extent Carmenere and Malbec.
Non-European wines almost always have the name of the grape (aka the varietal) on the label – for instance Cabernet Sauvignon from California.
Now you know!