Where does “قوش” come from?

قوش (Old Anatolian Turkish) comes from Common Turkic kuš, from Proto-Turkic kül — ash.

Ancestry of “قوش”, step by step

Step	Language	Word	Meaning
1	Common Turkic	kuš	bird
2	Proto-Turkic	kül	ash

قوش — Etymology, Origin & Word History | Etymology Explorer