Where does “Alĝero” come from?

Alĝero (Esperanto) comes from French Alger, from Algerian Arabic الدزَاير, from Arabic اَلْجَزَائِر, from Arabic جَزِيرَة — island.

Ancestry of “Alĝero”, step by step

StepLanguageWordMeaning
1FrenchAlgerAlgiers
2Algerian Arabicالدزَاير—
3Arabicاَلْجَزَائِرthe islands; Algiers
4Arabicجَزِيرَةisland
Every word from Arabic جَزِيرَة →Every word from Arabic اَلْجَزَائِر →Every word from Algerian Arabic الدزَاير →