QUOTE(Mars @ Oct 10 2007, 12:25 AM)

The ancient Indo-Europeans migrated into Pakistan, India, Iran, etc.. so its not surprising to find a remaining influence there.
Well, the Aryans originally came from these Afghanistan/ North Pakistan mountains (perhaps North-eastern "Iran" as well).The people of this region called themselves "Aryans" meaning the "noble" ones. Incidentally, the archaic name of their homeland was "Aryana" (to which the name "Iran" bears some noteworthy resemblance) . This is why there is a notable Aryan ("Iranian") presence there, consisting of people that are predominantly dolichocephalic ("long-headed") and displaying extreme leptorrhiny (thin, prominent noses).
This is in significant contrast to the Europeans, who display a varying mixture of alpine/brachycephalic ("broad-headed") measurements with varying degrees of dolichocephalic "admixture". The noses of the Europeans (Celts, Gauls, Slavs, Ugro-Finnics etc.) are also somewhat shorter and broader than those of the Aryans (Pathans, Persians, Kurds etc.). So the smaller degree of dolichocephalic admixture we observe in the European populations would likely have something to do with the sharp-featured, dolichocephalic Aryans migrating to Europe and encountering an already-established presence of Brachycephalic people there (i.e. the Celts and the Slavs, among others).
As for "nomenclature", there is no ancient people that called themselves "Indo-European". This would otherwise be a meaningless term except for the fact that it denotes the migration patterns of the Aryan migrants, who invaded Europe and India after abandoning their cold, harsh and desolate mountain home ["Aryana" the region that is now part of Eastern Afghanistan/ North-western Pakistan]. Hence, it is also useful in designating the languages that were influenced by these Aryan invasions into Europe and India (thus "Indo-European").
QUOTE
I thought most people belied Indo-Europeans' homeland was in Caucasus area.
Well, genetic tests confirm that a people of the Caucasus (the people of Dagestan from this particular example) are from the middle-east and yet many are also closely related to the Turks of Anatolia and Cyprus. [see reference below]. Chechens and Ingushetians are also from the Caucasus and are adjacent to the people of Dagestan.
However, they do not speak an "Indo-European" language, thus I certainly have to wonder how the "Indo-European" homeland could be here?
Finally, reputable linguistic studies generally trace the "indo-European" language migration patterns from an "Iranian" (Aryan) origin source.
Aformentioned Reference:[1] Hum Biol. 2006 Aug;78(4):465-76.Links
Genetic structure of Dagestan populations: a study of 11 Alu insertion polymorphisms.
Yunusbayev B, Kutuev I, Khusainova R, Guseinov G, Khusnutdinova E.
Institute of Biochemistry and Genetics, Ufa Science Center, Russian Academy of Sciences, Prospekt Oktyabrya, 71, Ufa, Russia.