Where does “Көк-Жаңгак” come from?

Көк-Жаңгак (Kyrgyz) comes from Kyrgyz көк, from Proto-Turkic *kȫk.

Ancestry of “Көк-Жаңгак”, step by step

Көк-Жаңгак traces back through two separate lines of ancestry.

via Kyrgyz көк

StepLanguageWordMeaning
1Kyrgyzкөкblue
2Proto-Turkic*kȫk—

via Kyrgyz жаңгак

StepLanguageWordMeaning
1Kyrgyzжаңгакwalnut, Juglans
2Proto-Turkic*yaŋgakwalnut
Every word from Proto-Turkic *kȫk →Every word from Kyrgyz көк →