It is not originated in Caucasia, even the Eupedia page you took info from explains it: ''Nevertheless, it is very unlikely that haplogroups J2 originated in the Caucasus because of the low genetic diversity in the region''
https://www.eupedia.com/europe/Haplo...J2_Y-DNA.shtml
Actually the exact opposite of what you have written is true; J spread there from south because as everybody knows it is a middle-eastern haplogroup and has got nothing to do with original Caucasians, especially northern ones
Being common somewhere is not necessarily means being originated there, that R1b for instance found mostly among 'Indo-europeans' doesnt make it IE or aryan, it is Turkic and brougth to Europe by Turkic warriors from Eurasian steppes. Yes, J1-J2 are found in Caucasus and even northern Caucasia but it is brought by Abbasid arabs to spread Islam back in late 8.century as historical evidence also proves (I read it on wiki too) along with persian-pashtun influence via southern Caucasia (over Persia and Armenia)
Please be informed
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