Where does “Başakşehir” come from?

Başakşehir (Turkish) comes from Turkish Başak, from Ottoman Turkish باشاق, from Proto-Turkic bAlak, from Proto-Turkic bāla — young animal; child; wife's younger sister.

Ancestry of “Başakşehir”, step by step

Başakşehir traces back through two separate lines of ancestry.

via Turkish Başak

Step	Language	Word	Meaning
1	Turkish	Başak	Virgo
2	Ottoman Turkish	باشاق	head of a sharp weapon such as a spear, spade, and especially of an arrow; spearhead, arrowhead
3	Proto-Turkic	bAlak	pant leg; ankle
4	Proto-Turkic	bāla	young animal; child; wife's younger sister

via Turkish şehir

Step	Language	Word	Meaning
1	Turkish	şehir	city
2	Ottoman Turkish	شهر	city; town; borough
3	Classical Persian	شهر	—

Every word from Proto-Turkic bāla →Every word from Proto-Turkic bAlak →Every word from Ottoman Turkish باشاق →