Presumably, Kurds, Albanians, and Afghans lived in the area since far earlier than the 14th century or thereabouts. Is it purely coincidence that all these cultures are Indo-European?
Oh yeah.
Let's not forget Chechens!
Interesting things:
One of the few tribes known to beat Genghis Khan & his Mongols. Twice (!)
If you got chased up into the mountains by invaders ( a common occurrence in the steppe country around the Caucuses), you could petition to become a sub-tribe/tribe in the Chechen nation (?).
Chechens are classified as Indo-Europeans and became Muslims only recently. Before than they were pagans & Christians.
Also: Azerbaijanians are descended from Kurds/Yezidis but somehow ended up being turkish-speakers, when they are actually Indo-European/Iranians. Go figure
More Also: Finns are originally barbarian Nomads that aren't even Turkish but ended up speaking a dialect of Turkish (!). They are a people related to Hungarians (!).
Known by different names
The Yezidis are pre-Islamic Kurds and their religion is shrouded in mystery. A little bit like the mysterious Druse who live in the Levant.
Albanians... well that's a curiosity. The region now know as Armenia (or is it Azerbaijania ?) was once called 'Albania' in ancient Roman literature. Tons of invader passing thru there, including invading Iranian-speaking nomadic tribes (Massagatae ?).
Afghans ? Descendants of all sorts of obscure regional empires like the Kushan. Or also known as Bactrian, Graeco-Buddhists.
Fascinating stuff.
And yes they are all know as Indo-European. And it's not a coincidence they are all mountain people; it's how you survive in those 'rough' neighborhoods (i.e. stay out of way of big Empires and invasion/migrations)