http://www.eupedia.com/forum/showthread.php?p=361412#post361412
haplogroup I are Germanic tribes originating from area Kerman/Germania (sometimes named Aria) in Iran and Serbo-Croatian part of Sarmatian tribes also originating from Iran
haplogroup I in Asia
http://sites.google.com/site/thelineagesofasia/
I would say this distribution shows passage of I from areas bellow Black sea and bellow Caspian sea to Europe through Caucasus. distribution indicates that the the passage is made next to the shores of Caspian sea which is logical route since east of it is mountain range...
furthermore, based on shape of its current distribution, and assuming general direction of movement towards north, I would dare to guess that perhaps the spread towards north started from iranian province of Kerman from where its carriers moved towards north, north-east, north-west and south-east...
Historical documents refer to Kerman as "Karmania", "Kermania", "Germania" and "Žermanya", which means bravery and combat. Geographers have recorded Kerman's ancient name as "Go'asheer" (Bardesheer).
http://en.wikipedia.org/wiki/Kerman_province
the province of Kerman is more or less same as area related to term Aria, which explains Germans calling themselves Aryans
http://en.wikipedia.org/wiki/File:Greco-BactrianKingdomMap.jpg
The term Aryan derives from the Sanskrit word (ā́rya) आर्य (meaning:Noble), which derived from arya, the original Indo-Iranian autonym. Also, the word Iran is the Persian word for land/place of the Aryan[17] (see also Iranian peoples).
http://en.wikipedia.org/wiki/Aryanism#Aryanism
haplogroup I1 has entered Europe via Caucasus
distribution of haplogroup I seems to have arrived in two waves that correspond to German and Sarmatian tribes
first wave was probably only I1
while Sarmatian wave brought I2 mixed with second wave of R1a
some Sarmatian tribes moved to live in Germany
e.g. for Veneti/Veneds we know that
http://en.wikipedia.org/wiki/Vistula_Veneti
similar story probably holds for Vandals who were probably I2a1 as attested by increased values of I2a1 in places of their last settlements (triangle Sevilla-Huelva-Cordoba in area of Andalusia in Spain and island of Sardinia)
see
http://www.eupedia.com/forum/showthread.php?t=25872 for details
haplogroup I2 has upon arrival to Europe or even before mixed with R1a..in fact mixture with R1a can be explained with knowing that in iranian lands R1a was situated at most east in areas of east Iran, Sogdia and Bactria..
comparing position of Pashtuns with small peak of I inside R1 area of Afganistan and Pakistan
http://sites.google.com/site/thelineagesofasia/
allows us to guess that I2, today dominant in south Slavs (Serbs and Croats), might be related to the small peak of I in that area...and that perhaps Pashtun tribe Sarbans is related to name Serbs..
on following map Pashtun Sarbans are in green
I would say it is perfect match
common origin from haplogroup I also explains similarity of names Sardinia/Sarbans/Serbi/Suebi/Swede for culturally and linguistically different nations of today that origin from haplogroup I
Peak of I haplogroup on northeast
is related to Sogdiana
http://en.wikipedia.org/wiki/Sogdiana
In fact, there was also early settlement by I2 that came to Europe before other I haplogroups and probably before most R1b (except perhaps the Basque which were first wave of R1b)
Veneti in Britanny do enter Britain as part of the Celtic wave...
they probably arrived in Europe as a first wave of I2 (carrying both I2a1 and I2a2), in more or less same time as first R1b settlers (Basques).. and before other I haplogroups...
http://www.eupedia.com/forum/showthread.php?t=26060
their origin is however the same with Sarmatian I2a1 and I2a2 carriers that came much later carrying the same tribal names - Veneti/Venedi and Vandali that settled in Germany
if you look map of haplogroup I
you may notice that M26 (I2a1) in Britanny in France matches pretty well the position of Veneti
Veneti in Britanny were probably celticized with spread of Hallstat La-Tenne culture...
lack of R1a in west France indicates that the first Veneti came as I2 but without R1a
while later Sarmatian Veneti might have been mixed with R1a already before entering Europe as attested by both R1a and I2 in both areas of Adriatic and Vistula Veneti... in area of Vistula Veneti besides I2a2 was also I2a1 of Vandals that eventually moved with sarmatian Alans and germanic Suebes to Iberian peninsula where they settled south most part known today as Andalusia..