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Originally Posted by
Gurka atla
This clearly proves that Finns Y-DNA were originally like Swedes, Norwegian and Danish who are also mainly haplogroup I which is typical of Scandivanian indo-european Y-DNA. They have either moderate frequencies N to 0% of N. Danish and Finns have similar mtDNA only the Y-DNA is different partially
Haplogroup I
A notable exception is Finland, where frequency in West Finns is up to 40%, and in certain provinces like
Satakunta more than 50%.

Well Finland's population was very low (they were still hunter-gatherers) when Swedish vikings began settling and raiding it. I think they left a big genetic imprint on them. The original Finns were probably an EEMH-Mongoloid mix, therefore I don't think they had blonde hair and other light features before they started mixing with Swedes. The genes for light features probably spread quickly in Finland due to aesthetic reasons, and then they remained Blonde due to geographic isolation (Finns are blonder now than the people that they got the Blonde hair genes from).