Where does “Шахля” come from?

Шахля (Russian) comes from Persian شهلا, from Arabic شَهْلَاء, from Arabic أَشْهَل.

Ancestry of “Шахля”, step by step

Step	Language	Word	Meaning
1	Persian	شهلا	dark blue mixed with red
2	Arabic	شَهْلَاء	—
3	Arabic	أَشْهَل	—