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The south is also full of French people from other regions that have northernized the region too, if you look at many surnames in the south these days they're French. Here are people from the south-west with native Gascon surnames and the difference between them and Eastern Spaniards is null imo:
23andme grouped them into one group because of the region between Germany and France (like Swiss, Benlux) has a lot of overlap. However many French people from France, especially the south got a lot of Iberian results. 23andme groups Hungarians and Russians together too..
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