Back in the Middle Ages, the Hanseatic League was an alliance of merchant guilds that held a huge trading monopoly in the Baltic region, making trading cities like Lübeck incredibly rich. In Bergen, Norway, you can visit an old guild house where they made a fortune dominating the stockfish trade. Dried cod was the bees knees back then.
A guild was called a Hanse, or in Latin, Hansa. You had the baker’s guild, the carpenters, the builders, the tanners and many more. And the merchants, of course. There was, however, no Luft-hansa, seeing as the airplane had not yet been invented.