Where does “déjà vu” come from?

déjà vu (Spanish) comes from French déjà-vu, from French VU, from Vietnamese vụ, from Chinese 務, from Sino-Tibetan *mow.

Ancestry of “déjà vu”, step by step

StepLanguageWordMeaning
1Frenchdéjà-vudéjà vu
2FrenchVUgiven based on
3Vietnamesevụseason; case, affair; specialized department...
4Chinese務—
5Sino-Tibetan*mow—
Every word from Sino-Tibetan *mow →Every word from Chinese 務 →Every word from Vietnamese vụ →