Where does “hạ nguồn” come from?

hạ nguồn (Vietnamese) comes from Vietnamese Hạ, from Proto-Vietic haːʔ, from Proto-Mon-Khmer haʔ — to open mouth.

hạ nguồn (Vietnamese): lower reaches

Definitions

  1. lower reaches

Ancestry of “hạ nguồn”, step by step

hạ nguồn traces back through two separate lines of ancestry.

via Vietnamese Hạ

StepLanguageWordMeaning
1VietnameseHạthe Xia dynasty
2Proto-Vietichaːʔ—
3Proto-Mon-Khmerhaʔto open mouth

via Vietnamese nguồn

StepLanguageWordMeaning
1Vietnamesenguồnsource; spring
2Chinese源—
Every word from Proto-Mon-Khmer haʔ →Every word from Proto-Vietic haːʔ →Every word from Vietnamese Hạ →