Most of these people are Gascons from areas around Landes. I removed not only foreigners, but also people with French surnames as there are many in the region. The rest have Gascon/Occitan surnames which include, in no order:

Taussac, Remazeilles, Daugreilh, Beguin, Iciaga, Labore, Labat, Maupome, Lassalle,
Ribette, Cuilhe, Peyres, Ducournau, Pouderau, Roussy, Gauzan, Caizergues
Argacha, Arberet, Laguille, Pérčs, Rande, Baudia, Mondes
Hourcade, Marty, Cabe, Lanet, Remazeilles, Bedouret, Homere,
Nadau, Singlade, Daumieres, Lozeille, Radot, Agreu, Billieres, Benony,
Gauzere, Touya, Lafourcade, Mespoulet, Lassalle, Arrogue, Pignon,
Guichard, Menard, Lespes, Lalanne, Vignoelles, Durrous, Cazenave,
Farthouat, Couzinet, Lassucq, Mauvoisin
Lesgourgues, Andalou, Cachenaut, Guirles,
Foures, Cambau, Gadoy, Lafargue, Buttignol,
Loupien, Pribat, Dronde, Lataste, Cazenave
Marque, Dartiguelongue, Lassabe, Darzacq, Dutoya, Galaber
Courtade, Merou, Texier, Lavedan, TIchit, Daugin, Portes, Castaigns
Capdeville, Bissalle, Darricarrere, Caliot, Cabannes, Benony, Lafargue, Lorreyte
Lafenetre, Tastet, Poquet, Larriu, Capdupuy, Lesbats, Ribette, Cuilhe
Martin, Cazaubon, Ducos, Tachon, Crassus, Cocherel, Dafau, Castex, Darros