Where does “Вьетнам” come from?

Вьетнам (Mongolian) comes from Russian Вьетна́м, from Vietnamese Việt Nam, from Vietnamese Nam Việt, from Middle Chinese 南.

Ancestry of “Вьетнам”, step by step

StepLanguageWordMeaning
1RussianВьетна́м—
2VietnameseViệt NamVietnamese
3VietnameseNam ViệtNanyue
4Middle Chinese南—
Every word from Middle Chinese 南 →Every word from Vietnamese Nam Việt →Every word from Vietnamese Việt Nam →