Where does “湄南河” come from?

湄南河 (Chinese) comes from Thai แม่น้ำ, from Thai น้ำ, from Proto-Tai *C̬.namꟲ — water.

Ancestry of “湄南河”, step by step

StepLanguageWordMeaning
1Thaiแม่น้ำriver
2Thaiน้ำwater; any liquid or fluid; body of water, as...
3Proto-Tai*C̬.namꟲwater
Every word from Proto-Tai *C̬.namꟲ →Every word from Thai น้ำ →Every word from Thai แม่น้ำ →
湄南河 — Etymology, Origin & Word History | Etymology Explorer