Basque people are the only Western Europeans that speak a non-Indo-European language - the Basque language - without having any known contemporary European ethnic or linguistic relatives.[2] A 2015 DNA study supports the idea that the Basques descend from Neolithic farmers who mixed with local hunters and were subsequently isolated for millennia.[3][4]
^Günther, Torsten; Valdiosera, Cristina; Malmström, Helena; Ureña, Irene; Rodriguez-Varela, Ricardo; Sverrisdóttir, Óddny Osk; Daskalaki, Evangelia A.; Skoglund, Pontus; Naidoo, Thijessen; Svensson, Emma M.; Bermúdez De Castro, José María; Carbonell, Eudald; Dunn, Michael; Storå, Jan; Iriarte, Eneko; Arsuaga, Juan Luis; Carretero, José-Miguel; Götherström, Anders; Jakobsson, Mattias (July 29, 2015). "Ancient genomes link early farmers from Atapuerca in Spain to modern-day Basques". Proceedings of the National Academy of Sciences. 112 (38). National Academy of Sciences.: 11917–11922. Bibcode:2015PNAS..11211917G. doi:10.1073/pnas.1509851112. PMC4586848. PMID26351665.