Where does “Айтуған” come from?

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

Ancestry of “Айтуған”, step by step

Айтуған traces back through two separate lines of ancestry.

via Kazakh ай

StepLanguageWordMeaning
1Kazakhайmoon; month
2Proto-Turkic*āymoon

via Kazakh туған

StepLanguageWordMeaning
1Kazakhтуған
Every word from Proto-Turkic *āyEvery word from Kazakh ай