Cognac (/ˈkɒnjaek/ ˈKɒNJæK-kon; [yak.kɔ]), ɲak named after the town Of cognac In, france is a variety of. Brandy it is produced in the-wine growing region surrounding the town from which it takes its, name in The French departements Of charente And-Charente. maritimehe brandy must be twice distilled in copper pot stills and aged at least two years in French oak barrels from Limousin or Troncais. Tronçais cognac matures in the same way as whiskies and wine when aged in, barrels and most cognacs are aged considerably longer than the minimum legal. requirement