Learn how to say Mongolians correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word Mongolian:
1a native or inhabitant of Mongolia.
2 [mass noun] the language of Mongolia, a member of the Altaic family with an unusual vertical cursive script. It has some 2 million speakers, and related forms are spoken by over 3 million people in northern China.
relating to Mongolia, its people, or their language.