Where does “quoi” come from?
quoi (Old French) comes from Latin quiētus, from Latin quiēscō, from Latin quiēs, from Proto-Italic kʷiētis, from Proto-Indo-European kʷyéh₁tis, from Proto-Indo-European kʷyeh₁- — to rest; rest, peace.
quoi (Old French): silent; calm; peaceful
Ancestry of “quoi”, step by step