As you know, the ancestors of today's Iranians were nomads. So were their forgotten relatives - Scythians, Sarmatians, Aryans, etc., who maintained a nomadic lifestyle for longer, but disappeared from the face of the earth. However, there were still people who stayed! A group of Persian-speaking tribes, the Bakhtiyars, roamed the territory of several Iranian provinces. About half a million of them. And, although many families are thought to have settled in existing winter and summer camps, they have not yet transitioned to a completely sedentary lifestyle (but of course they will, it's the fate of all). By the way, the word "Bakhtiyar" itself is clearly a proper name. This is the name of the head of one of the most powerful tribes of Zagros - this is the 16th century AD. This is also very typical for nomads - named after the leader and stands out as a separate people. By the way, the Shah of Iran could not really conquer Bakhtiar for a long time; By historical standards, this happened as recently as 1736. The Bakhtiar dialect is part of Persian, but it is very diverse, not uniform. This is again due to the fact that the tribes are nomadic and do not have frequent contact with each other.
