Where does “adieu” come from?

adieu (Dutch) comes from French adieu, from Old French a Dieu vos comant.

adieu (Dutch): farewell, adieu

Definitions

Step	Language	Word	Meaning
1	French	adieu	farewell, adieu; goodbye, see you soon; hello
2	Old French	a Dieu vos comant	—

adieu — Etymology, Origin & Word History | Etymology Explorer