Daewoo. They're a Korean company and their main factories are in Korea, but they have factories in other countries throughout Asia and, IIRC, in Eastern Europe. They are currently owned primarily by General Motors, so many of their cars are sold as Chevrolets, Buicks, and Suzukis depending what country they're being sold in.
While Suzuki is aligned with GM (who has a small ownership stake in Suzuki, nothing like they have in Daewoo), the Suzuki-Daewoo connection is independent of GM. All but one of Daewoo's original models were based on Suzuki models, and the Matiz is an independent evolution of a 20 year old Suzuki Alto.
There should be a label with the country in which it was assembled somewhere on your car.