Cognac is a commune in the Charente department, southwestern France. Administratively, the commune of Cognac is a subprefecture of the C…Cognac is a commune in the Charente department, southwestern France. Administratively, the commune of Cognac is a subprefecture of the Charente department. The name is believed to be formed from individual masculine name -Connius, Gallic name, and the suffix -acum, which would correspond to the "domain of Connius".