There are some differences between Cognac and Armangnac aside from region of original.
Bourbon under US law can only be produced in the US. Maybe somewhere someone else makes something called bourbon, I don't know. The basic requirements for bourbon are made in the US, 2 years of aging (at least), and 50+ corn (up to 79% I think) in the mash. It has an interesting history, including the fact that none is currently made in Bourbon County, KY (though I think someone was building a distillery).
Champagne is the same way in effect, it can only be made in Champagne, but if you look at a bottle of Korbel, you will see on the label "California Champagne". They were grandfathered in basically. There are a couple others than can label that way in CA also.
French wines of course are labeled with place names, while US wines are labeled as varietals. I see more and more French wine labels including the varietal, but you're supposed to know. I actually know some oenophiles in France who pay no attention to the varietal in a wine. They know what Bordeaux is, but can't name the five varietals that can be used in it (if it's red) and don't care.
Most know that Burgundy is pinot noir or chardonnay, but they don't know the minors that can be used, and they have no idea what grapes can be used in Champagne.
We were in Costco today and they had some ridiculous prices in Chianti Classico Riserva. They also had a Burgundy for $10. I don't know how they get prices down that far other than scale of course. I'll try the Burgundy tonight.
They have crazy insane wine prices around here.