Where does “بیكباشی” come from?

بیكباشی (Ottoman Turkish) comes from Ottoman Turkish باش, from Old Anatolian Turkish بَاشْ, from Proto-Turkic baĺč — head; beginning.

Ancestry of “بیكباشی”, step by step

Step	Language	Word	Meaning
1	Ottoman Turkish	باش	head; chief, master, leader, head; prow, bow,...
2	Old Anatolian Turkish	بَاشْ	—
3	Proto-Turkic	baĺč	head; beginning

بیكباشی — Etymology, Origin & Word History | Etymology Explorer