The Thai language belongs to the "Austro-Asiatic" family. Since Thailand and Vietname are peninsulas. "Austro" means "sailor" and "Asiatic" means "Asian".The other person is incorrect, Thai is not...
East Slavonic group, same as Russian, Belarusian and Rusyn. Which itself is a subfamily of the Slavonic family of languages. They are the three I just mentioned, as well as Serbian, Croatian,...