About southeast France in particular,
From Savoy, you can look at French winter sports champions, they are almost all from there.
From Ardèche, here are few names : - René Privat, Pascal Fugier, Cédric Chabert, Delphine Combe, Jean-Marie Cuoq, Jean-Philippe Faure, Franck Sauzée, Alain Planet, Hervé Giraud, Michel Teston, David Mourier, François Félix, Jean-Marc Gounon, Clément Grenier, Amandine Leynaud, Benoit Peschier, Julien Rochedy, Sébastien Chabal, Gérard Mourou, Anne-Sophie Pic, Jean-François Piège, Florent Peyre, Rémy Martin, Bertrand Gille...
From Provence : (in the the XIXth and XXth centuries) : Henri Marie Léonce Fabre, Jean Bouin, Fernand Bouisson, Alexandre Blanc, Joseph Fallen, Frédéric Mistral, Maria Borrély, Marie-Antoinette Roumanille, Henri Poupon, Jules Muraire, Henri Marius Roger Bourrely, Fernand Charpin, Paul Ricard, Charles Maurras, Frédéric Lazard, Aimé Michel...
- (in the XXth and XXI centuries) : Lucien Aimar, Jean-Claude Magnan, Pierre Magnan, Jean-Michel Bayle, Jean Rolland, Michèle Mouton, Gilles Rousset, Marcel Aubour, René Girard, Arnaud Clément, Alain Bernard, Benoit Paire, Christophe Maé, Camille Combal, Julien Aubert, Jean-Robert Lombard, Jean-Baptise Maunier...
In Provence, immigration has been absolutely huge, especially on the seaside. So the most difficult thing is to find natives from these places. Most of the people I just mentionned come from inland Provence (which has also been subject to huge immigration, but a bit less, hence "survivors" here and there lol).
People from the seaside seemed to look a bit more Mediterranean (as in the examples from the XIX/XXth centuries mentioned above ), perhaps due to the old Greek influences, or just native people.
Here is a genetic study on people from Provence (which aimed at discovering the genetic impact of Greeks in the region) :
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3068964/ . If I understood the results correctly, it says that there is a noticeable gentic impact of Greeks, but that the vast majority would of people from this area used to be similar to Basques.
On the whole, according to me southeast France didn't seem that different from the rest of France. It seemed a bit more "mediterranean" on the seaside, but on the whole, we see the same combination found anywhere else in France : more blond people than in southern Europe, but more brown hair people than in northern Europe, a lot of of fair eyes (especially blue eyes) and a lot of intermediate profiles or mixed profiles (blond hair with dark eyes, blue eyes and dark hair/light brown hair/dark blond, green eyes)... Southern France didn't seem that different from Northern Italy and Northern Spain, but probably with a more northern vibe (not everywhere though).
I wish it helped you in your study or that you could at least discover interesting French people in the people I mentioned...
Greetings
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