Where does “الجزایر” come from?

الجزایر (Persian) comes from Arabic اَلْجَزَائِر, from Arabic جَزِيرَة — island.

Ancestry of “الجزایر”, step by step

Step	Language	Word	Meaning
1	Arabic	اَلْجَزَائِر	the islands; Algiers
2	Arabic	جَزِيرَة	island

الجزایر — Etymology, Origin & Word History | Etymology Explorer