une appellation d'origine contrôlée (AOC) (now named AOP, appellation d'origine protégée)
there are lots of famous vineyards, and not always big ones. Some famous and very expensive wines (Château-Margaux, Château-Cheval-blanc, Petrus, Château-Lafitte-Rotchild, ...) are brand names...
A Viticulturist
no there isn't
grand cru