Where does “الصين” come from?

الصين (South Levantine Arabic) comes from Arabic الصِّين, from Middle Persian 𐭰𐭩𐭭, from Sanskrit चीन, from Old Chinese 秦 — {{w|Qin |State of Qin}}, {{w|Qin dynasty}}; Qin.

Ancestry of “الصين”, step by step

Step	Language	Word	Meaning
1	Arabic	الصِّين	—
2	Middle Persian	𐭰𐭩𐭭	China
3	Sanskrit	चीन	the Chinese people; China; a bandage for the...
4	Old Chinese	秦	{{w\|Qin \|State of Qin}}, {{w\|Qin dynasty}}; Qin

Every word from Old Chinese 秦 →Every word from Sanskrit चीन →Every word from Middle Persian 𐭰𐭩𐭭 →