Where does “Айтуған” come from?

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

Ancestry of “Айтуған”, step by step

Айтуған traces back through two separate lines of ancestry.

via Bashkir ай

StepLanguageWordMeaning
1Bashkirайmoon; month
2Proto-Turkic*āymoon

via Bashkir туған

StepLanguageWordMeaning
1Bashkirтуғанblood relative, relation, member of one's (nuclear or extended) family
Every word from Proto-Turkic *āy →Every word from Bashkir ай →