BTW - here is an interesting paper, which reveals a correlation between genetics and linguistics among Indo-European speakers:
http://www.jolr.ru/files/(105)jlr2013-9(23-35).pdf
We do not expect that the history of Indo-Europeans followed the same clear model as that of the North Caucasians. It is therefore even more interesting to apply the same methodology to the IE case. So far, we have performed only one, but the most important kind of analysis — the correlation analysis of genetic, linguistic and geographic distances between the Indo-European populations of Europe. (We did not include Indo-Iranian populations because the Indian gene pool is much too different from the European one). This kind of analysis had already been performed earlier, in 2000 [Rosser et al., 2000], where it was found that both correlations are about r = 0.3. Twelve years later we repeated this analysis using a dataset that was ten times as large (Table 1). We found correlations that were twice as high (0.67 between genetics and linguistics and 0.70 between genetics and geography). In contrast with the case of the Caucasus, the partial correlation indicates a more important role of geography (genetics and geography r = 0.32, while genetics and linguistics only r = 0.21). However, the high pair correlation with linguistics (r = 0.67) allows to use the statistical data as good predictors of genetic similarity between populations
A very interesting chart from page 5 (genetic distances of
mitochondrial DNA between major IE groups):
We notice that:
1) Generally languages correlate well with genetic distances.
2) There are some sharp exceptions from this rule, including:
a) Hungarians - they are genetically like Slavonic group, yet speak a Non-IE language
b) Romanians - genetically half-way between Slavonic & Germanic, yet speak Romance
b*) Aromuns - genetically (mtDNA) most similar to Slavonic group, yet speak Romance
c) Sicilians - genetically far away from all other groups, yet speak Romance
3) Some other quick observations:
d) Albanians - genetically in the middle between Germanic, Romance, Slavonic, and Baltic
e) Norwegians & Germans - genetically closest to Slavonic & Romance out of all Germanic groups
f) Icelanders and Austrians - relatively close to Celtic group (even closer than English)
g) Slavonic - genetically about half-way between Baltic and Germanic (interesting!)
h) Icelanders - mitochondrial DNA is very Celtic (pretty consistent with other studies).
i) Germanic group - in the middle between Celtic, Romance & Balto-Slavonic (fits with geography)
Remember that this is mitochondrial only (so Y-DNA and autosomal DNA was not compared).