Where does “Алтынай” come from?

Алтынай (Kazakh) comes from Kazakh ай, from Proto-Turkic *āy — moon.

Ancestry of “Алтынай”, step by step

Алтынай traces back through two separate lines of ancestry.

via Kazakh ай

StepLanguageWordMeaning
1Kazakhайmoon; month
2Proto-Turkic*āymoon

via Kazakh алтын

StepLanguageWordMeaning
1Kazakhалтынgold
2Proto-Turkicaltungold
Every word from Proto-Turkic *āy →Every word from Kazakh ай →