varietals...

[Jerry D Mead]

Gamay is a grape variety, though not a great deal of it is grown in America.

The 75% rule applies to American wines.

In France (and most of Europe) wines are much more often named for places or vineyards than for the grapes from which the wines are made (there are exceptions, especially in Alsace and Germany). Also, when the French adopt the American fashion of varietal labeling, their laws require that the wine be 100% varietal.

Re the regional thing, for example...Burgundy is the place...for red the variety is Pinot Noir...for white it is Chardonnay...then it gets more confusing...because within the greater area of Burgundy, some wines get named for smaller subdivisions such as Communes (sort of like counties) down to specific vineyard names...but the same rules for the Burgundian varieties holds...so names like Beaune, Montrachet, Chablis, Pouilly Fuisse, and Meursault are all places inside Burgundy and are primarily made from either Pinot Noir or Chardonnay.

There is much too much involved in this understanding how wines are labeled internationally to explain here...you really need to pick up couple of basic books to refer to.