Where does “air” come from?

air (Middle French) comes from Old French air, from Latin āēr, from Ancient Greek ἀήρ, from Ancient Greek auhḗr.

Ancestry of “air”, step by step

Step	Language	Word	Meaning
1	Old French	air	air mixture of gases that make up the earth's atmosphere
2	Latin	āēr	air
3	Ancient Greek	ἀήρ	mist; air; wind
4	Ancient Greek	auhḗr	—