Where does “dầu lửa” come from?

dầu lửa (Vietnamese) comes from Vietnamese lửa, from Proto-Vietic -laːs, from Proto-Mon-Khmer slaas — fire, to burn.

Ancestry of “dầu lửa”, step by step

dầu lửa traces back through two separate lines of ancestry.

via Vietnamese lửa

StepLanguageWordMeaning
1Vietnameselửafire
2Proto-Vietic-laːsfire
3Proto-Mon-Khmerslaasfire, to burn

via Vietnamese dầu

StepLanguageWordMeaning
1Vietnamesedầuoil; "Dipterocarpus"
2Middle Chinese油—
Every word from Proto-Mon-Khmer slaas →Every word from Proto-Vietic -laːs →Every word from Vietnamese lửa →