I want to know the answer to the following question:
What is attested as a self-identifier in Iranian languages?
All the background I'm provided with is that "The term Iran derives directly from Middle Persian Ērān, first attested in a 3rd-century inscription at Rustam Relief, with the accompanying Parthian inscription using the term Aryān, in reference to Iranians.". Is that enough to answer the question?
Answer: no