It hasn't much to do with Finns though. Wouldn't like to go to OT but you can start by reading at least
Finnish origins and genetics from wikipedia:
https://en.wikipedia.org/wiki/Finns#Genetics
https://fi.wikipedia.org/wiki/Suomalaiset#Suomalaisten_esihistoria
Tsingis khan lived in 1200 century, Finns have entered the Europe around 10 000 years ago according to actual dna study and science. Absolutely not in 0bc time like some old theories recorded. Swedish race theory books in 1800 or eaerlier are trash. There is recordings on central european scientist visiting Finland and recording that they did not see any Finns at all, because those books tolds Finns have darker skin than europeans and eyes like chinese people and people in Finland didin't match them.
Sweden was acting bit racist against Finns and officially thought Finns as a colony area and second class people. Finns weren't even allowed to use their own language in their own countrys agencies ect. Swedes still call us mongols some times, but it's because they want to mock us us, not because they appreciate us, so I don't like using tsingis khan in chants
:
"Recently, the use of mitochondrial "mtDNA" (female lineage) and Y-chromosomal "Y-DNA" (male lineage) DNA-markers in tracing back the history of human populations has been started. For the paternal and maternal genetic lineages of Finnish people and other peoples, see, e.g., the National Geographic Genographic Project and the Suomi DNA-projekti. Haplogroup U5 is estimated to be the oldest mtDNA haplogroup in Europe and is found in the whole of Europe at a low frequency, but seems to be found in significantly higher levels among Finns, Estonians and the Sami people.[36] The original European hunter-gatherers that populated large parts of Europe before the early farmers appeared are outside the genetic variation of modern populations, but most similar to Finnish individuals.[37]"
It rather seems that we are very original and real europeans more than some others are. Of course we came from north ural when you go back long enough but also every route leads to Africa if you go far enough.
In my opinion, the "HU" is so simple it hans't automatically anything to do with Vikings. Any one could do that and probably has done something very similar to that to raise the spirit. But if it's chant used by Icelandic fans then others shouldn't copy it and if it was the case that Icelanders tried to cheer for their team and the finns joined, then I agree it's rather weird..
On topic.. Basket ball is nice. New sport to follow casually at least on NT level.