Where does “Azerbaijani” come from?

Azerbaijani derives from English Azerbaijan, which comes from Arabic أَذَرْبَيْجَان, ultimately from Persian آذربادگان.

Azerbaijani (English): A person from Azerbaijan or of Azerbaijani...

Definitions

Step	Language	Word	Meaning
1	English	Azerbaijan	—
2	Persian	آذربایجان	—
3	Ancient Greek	Ἀτροπατηνή	—
4	Ancient Greek	Ἀτροπατηνός	—
5	Ancient Greek	-ηνός	-ian, -ese
6	Ancient Greek	-νός	Alternative form of -νος
7	Proto-Indo-European	dʰeh₁-	to do, put, place