Here's some info.
Geographic distribution
The highest frequency of occurrence of epicanthic folds are found in: East Asians, Southeast Asians, Central Asians, North Asians, some Polynesians, Micronesians, Native Americans (as well as Mestizos), the Khoisan, and the Malagasy. In some of these populations the trait is almost universal, specifically in East Asians. Epicanthic folds occur, but at considerably lower frequency, in: Europeans (e.g., Scandinavians, English, Irish,[6] Hungarians, Russians, Poles, Lithuanians, Finns, Estonians and Samis),[7][8] South Asians, Western Asians, Nilotes and Amazigh people.[9] The degree of development of the fold between individuals varies greatly and its presence or absence is often subjective, also its frequency varies clinally across Eurasia. Its use, therefore, as a phenotypic marker to define biological populations is debatable
https://en.wikipedia.org/wiki/Epicanthic_fold
So a lot of populations can have people that have epicanthic folds but but it is more common in the usual suspects.
This anthropologist said it's even in the Irish.
According to Poirier, the problem with this theory is that a substantial portion of the Asian population evolved in areas outside of the tropical and arctic regions. In addition, he says epicanthic fold is not limited to Asians. ''John F. Kennedy had a variance of the fold and it is found among Europeans, especially the Irish,'' he said. ''It`s just less prevalent.'' The fold is also found among infants worldwide. Poirier attributes the fold to pleiotropic genes--single genes that control more than one characteristic or function--but he has no explanation for its origin.
https://www.chicagotribune.com/news/...141-story.html
Here's a video on the topic.
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