Elemental plane of air use this auran language dnd 5e to communicate. Old Alzhedo was its another name. Auran was the relaxed and breathy language. It was the dialect of primordial so the creatures who speaks primordial elemental languages those creatures can understand auran too and vice-versa.
The derivative languages of auran are Alzhedo and also Midani. Sometimes this auran 5e language spoken by the Air genasi and also the smoke drakes.
Also read: Elvish translator 5e