Where does “Oybek” come from?

Oybek (Uzbek) comes from Uzbek oy, from Chagatai آی, from Proto-Turkic *āy — moon.

Ancestry of “Oybek”, step by step

Oybek traces back through two separate lines of ancestry.

via Uzbek oy

StepLanguageWordMeaning
1Uzbekoymonth; moon
2ChagataiآیMoon; month
3Proto-Turkic*āymoon

via Uzbek bek

StepLanguageWordMeaning
1Uzbekbeka title of local officials, beg
Every word from Proto-Turkic *āy →Every word from Chagatai آی →Every word from Uzbek oy →