köken: Genericized trademark of Thermos LLC, a manufacturer of insulated food and beverage containers and other consumer products. The company was originally founded in Germany in 1904 and is now headquartered in the United States, under the ownership of the Japanese company Nippon Sanso. The word itself is from Ancient Greek θερμός (thermós, “warm”), from Proto-Indo-European *gʷʰer-.
köken: Calque of Chinese 水瓶 (thuỷ bình, “water bottle”). The morpheme thuỷ (水) was likely not translated to native nước in order to avoid confusion with usual water bottles.