'Elzas' originates from Dutch, ultimately from the regional names in French and German; specifically from French 'Alsace' (Medieval Latin 'Alsatia') and German 'Elsass'.

'Elzas' changed from Medieval Latin 'Alsatia' into Old/Modern French 'Alsace' and German 'Elsass', and was adopted into Dutch as 'Elzas'.

Initially, the terms (Alsatia/Alsace/Elsass) referred to the same geographic region; the meaning has remained the regional place-name 'Alsace' into modern usage.