Where does “thứ tư” come from?

thứ tư (Vietnamese) comes from Vietnamese thứ, from Chinese 首, from Proto-Sino-Tibetan *qV-luʔ — head.

thứ tư (Vietnamese): fourth; Wednesday

Definitions

  1. fourth; Wednesday

Ancestry of “thứ tư”, step by step

thứ tư traces back through two separate lines of ancestry.

via Vietnamese thứ

StepLanguageWordMeaning
1Vietnamesethứinferior in quality, second, second vice, under;...
2Chinese首neck
3Proto-Sino-Tibetan*qV-luʔhead

via Vietnamese tư

StepLanguageWordMeaning
1Vietnamesetưfour; fourth; third-born
Every word from Proto-Sino-Tibetan *qV-luʔ →Every word from Chinese 首 →Every word from Vietnamese thứ →