Where does “Байрамбикә” come from?

Байрамбикә (Bashkir) comes from Bashkir байрам, from Common Turkic badram, from Iranian word.

Ancestry of “Байрамбикә”, step by step

Step	Language	Word	Meaning
1	Bashkir	байрам	holiday; festivity, celebration, feast; party,...
2	Common Turkic	badram	—
3	Iranian	word	—

Байрамбикә — Etymology, Origin & Word History | Etymology Explorer