Etymology "Algeria"

Etymology of "Algeria" from Wikipédia

The name Algeria is derived from the name of the city of Algiers (French Alger), from the Arabic word al-jazā’ir, which translates as the islands, referring to the four islands which lay off the city's coast until becoming part of the mainland in 1525. Al-jazā’ir is itself a truncated form of the city's older name jazā’ir banī mazghannā, "the jazeera of (the tribe) Bani Mazghanna", used by early medieval geographers such as al-Idrisi and Yaqut al-Hamawi.