we do not know what was the language of R1a-M458 people (dominant marker in Poles) but we can only assume that they are in Europe last 14kya, and originally on Balkan....
Pelasgi(ans) are good guess due to same key word used for tribal name
polje = field => Poljaci
Pelagos = field, flatland, sea (probably loan word from Pelasgian language to Greek) => Pelazgi
those are pretty strong indications that west Slavs origin from ancient Balkan people very likely from Pelasgians.....I do not make any claim about languages as languages can change fast as we know on case of latin spoken originally only in rome and its derivatives spread fast to big chunk of Europe and to latin America, and from celtic languages disappearing from vast area in short time... looking history through language only is unreliable... it works only for quite recent and already known history...
i will add that only extremely biased people with strong anti-slavic agenda can apriori discard all these thoughts above as rubish and threaten with ban to people who dare to think about it...
i thought in 21 century in europe I will not need to fight for freedom to say what i think.....
there are still avars in caucasus... not sure anymore, but as far as I remember they were J2...
what is opposite? that R1a were associated with Kurgan? that r1a was associated with PIE? that PIE was spread by Kurgan culture?
in my posts :)
data comes from someone's effort, alike to what Maciamo do on this site, to collect published data for Asia and make maps of haplogroups...
https://sites.google.com/site/thelineagesofasia/
I have paid attention to map for haplogroup I (my guess is that it is mostly I2a2 as in Asia it is usually I2a2) and determined that it has hotspots that exactly match spread of Pasthun Sarbans, and also spread in Serica north of Tibet, and hotspot in Kyrgizstan/Uzbekistan where Sart people live...e.g. around this place
http://en.wikipedia.org/wiki/Margelan which is place where white Sart people live and place that has ancient tradition of silk production indicating origin from Serica...
regarding Kurds, their tribal name I relate to Sherdana, because after studying description of conquest of sea people it was clear that they were northerners, that majority of army was going via land, and that it was settlement wave with woman and children, that judging by order of conquest preserved in historic record, they did make cut from Black sea to south of Asia minor and than to Syria...
all this suggests key settlement exactly in Kurdish area which is strategic bridge between Black sea and Syria....
furthermore Kurds have significant European genetics (R1a+I2a) of rather recent origin.... Kurds have tribal name alike to Sherdana...
note that Sherdana give name Serbonian bog in Egypt...
so idea is that I2a people carried with themselves tribal name recorded in variants Sherd/Sard/Serd/Serb/Kurd/Scord/Sart/Ser... depending on transcriptions of writers and ending due to being classified in this or that culture,,,
I do not know what language those tribes spoke... but I do notice that pattern of haplogroup I in Asia does match supposed spread of PIE people from homeland that in fact matches Kurdish areas....
regardless of language,
I go step further and suggest that Sherdana are no other than early wave of Scordisci along Danube to Black sea... . Scordisci give name Scardus mountain (Shar Dag in turkish) in south Serbia....reason I suggest this is that Scordisci have for long time dwelled along Danube.....and that it is evident that, apart from Hercegovina, which is initial settlement of Serbs and Croats, I2a-Din reaches maximum in areas along Danube with some of the hotspots in end of that area in Ukraine...and on start of the area in Bohemia...I2a-Din was in my opinion related to Danube from ancient times...there we again have issue with Seneca relating Serians to Danube...as people who dare to cross frozen Danube on bare foot...Serians are same as Serres who live in Serica which is Asia north of Tibet (which is where Sart and white(west) Sart people now live) and in arc from there to India (this arc is clearly visible in haplogroup I map from site above and it matches arc shaped spread of Pastun Sarbans with arc making knee on exactly same place in Sarbans and haplogroup I....
Serians is same tribal name as Scirians (Sciri) so it is a question whether those were again same people...if they were it is a clue that Scirii-Heruli might have been forefathers of Serbs and Croats.... again, I will not speculate about what could have been their original language in that case...I would note only that Scirii are by some authors claimed to be Alans/Sarmatians