Origin of the Basques

The origin of the Basques and the Basque language is a controversial topic that has given rise to numerous hypotheses. Modern Basque, a descendant or close relative of Aquitanian and Proto-Basque, is the only Pre-Indo-European language that is extant in western Europe. The Basques have therefore long been supposed to be a remnant of a pre-Indo-European population of Europe.
The main hypotheses about the origin of the Basques are:
Native origin theory.
According to Stephen Oppenheimer, from c.16,000BC, the warmer climate allowed the expansion of proto-Basque groups, or proto-Europeans, across the north of Africa and the entire continent of Europe, expanding the Magdalenian culture across Europe.
In 2008, the Finnish linguist Kalevi Wiik proposed that the current Basque language is the remainder of a group of "Basque languages" that were spoken in the Paleolithic throughout western Europe and that retreated with the progress of the Indo-European languages. Wiik states that his theory coincides with the homogeneous distribution of the Haplogroup R1b in Atlantic Europe.
Ludomir R. Lozny states that "Wiik's controversial ideas are rejected by the majority of the scholarly community, but they have attracted the enormous interest of a wider audience."
Paleogenetic investigations.
In May 2012, the National Geographic Society Genographic Project released a study that showed through detailed DNA analysis of samples from French and Spanish Basque regions that Basques share unique genetic patterns that distinguish them from the surrounding non-Basque populations. The results of the study clearly support the hypothesis of a partial genetic continuity of contemporary Basques with the preceding Paleolithic/Mesolithic settlers of their homeland.
Paleogenetic investigations by the Complutense University of Madrid indicate that the Basque people have a genetic profile coincident with the rest of the European population and that goes back to Prehistoric times. The haplotype of the mitochondrial DNA known as U5 entered in Europe during the Upper Paleolithic and developed varieties as the U8a, native of the Basque Country, which is considered to be Prehistoric, and as the J group, which is also frequent in the Basque population. The works of Alzualde A, Izagirre N, Alonso S, Alonso A, de la Rua C. about mitochondrial DNA of the Human remains found in the Prehistoric graveyard of Alaieta, in Alava, note that there are no differences between these remains and others found across Atlantic Europe.
Studies based on the Y chromosome genetically relate the Basques with the Celtic Welsh, and Irish; Stephen Oppenheimer from the University of Oxford says that the current inhabitants of the British Isles have their origin in the Basque refuge during the last Ice age. Oppenheimer reached this conclusion through the study of correspondences in the frequencies of genetic markers between various European regions. The haplogroup R1b, can be found most frequently in the Basque Country (91%), Wales (89%) and Ireland (81%). The age of subclade which Basque carry, Haplogroup R1b-DF27, "is estimated at ~4,200 years ago, at the transition between the Neolithic and the Bronze Age, when the Y chromosome landscape of Western Europe was thoroughly remodeled. In spite of its high frequency in Basques, Y-STR internal diversity of R1b-DF27 is lower there, and results in more recent age estimates", implying it was brought to the region from elsewhere. 
In 2015, a new scientific study of Basque DNA was published which seems to indicate that Basques are descendants of Neolithic farmers who mixed with local hunters before becoming genetically isolated from the rest of Europe for millennia. Mattias Jakobsson from Uppsala University in Sweden analysed genetic material from eight Stone Age human skeletons found in El Portalón Cavern in Atapuerca, northern Spain. These individuals lived between 3,500 and 5,500 years ago, after the transition to farming in southwest Europe. The results show that these early Iberian farmers are the closest ancestors to present-day Basques. The official findings were published in "Proceedings of the National Academy of Sciences" of the United States of America. "Our results show that the Basques trace their ancestry to early farming groups from Iberia, which contradicts previous views of them being a remnant population that trace their ancestry to Mesolithic hunter-gatherer groups," says Prof. Jakobsson. However, the results also showed that Basques, along with many other Iberian groups, carry both Neolithic farmer ancestry as well as some local mesolithic hunter-gatherer ancestry; showing that "the incoming farmers admixed with local, Iberian hunter-gather groups, a process that continued for at least 2 millennia."
Rather, some 4500 years ago almost all Y-DNA heritage from Iberian admixture of Mesolithic hunter-gatherers and Neolithic farmers was replaced by the lineage of Indo-European herders from the steppe, and the Basque genetic distinctiveness is a result of centuries of low population size, genetic drift, and endogamy. In 2019, a study was published in "Science" in which a more fine-tuned and deep time-transect of Iberian ancient populations including the Basque were analyzed. From their abstract, it says: "and we reveal that present-day Basques are best described as a typical Iron Age population without the admixture events that later affected the rest of Iberia." This indicates Basques were isolated from admixture with outside groups since at least 1000BC or 3000 years before the present. In Iberia, these later admixture (interbreeding) events were with central European (Celtic), eastern Mediterranean and northern African populations, and genomic ancestry from them are found in all or most present-day Iberian populations, except for the Basque.
Linguistics.
In the field of linguistics, there are two lines of investigation, both based on etymology; one on toponyms, not only in the Basque Country but also in the rest of the Iberian Peninsula and Europe, and the other on the etymology of Basque words.
The "aizkora" controversy.
Some vasconists have, in the past, suggested that Basque may have several words, all related to tools, that are derived from the root word for "stone", "haitz". These include:
Theories regarding the possibility of such a shared root have been put forward by Louis Lucien Bonaparte, Miguel de Unamuno, Julio Caro Baroja and others. One inference of these hypothetical and controversial etymologies was that some aspects of the Basque language had been stable and uninfluenced by other languages since the Stone Age.
However, these etymologies are now doubted by mainstream vasconists. "Aizkora" has been identified as a loan from the Latin "asciola". The root of the remaining terms – based on the Roncalese dialect, which is known for its preservation of historical nasals and has the documented forms "antzur", "ainzter", "aintzur" and "ainzto" – was "ainz-" and thus the reconstructed root was *"ani(t)z" or *"ane(t)z". There are no traces of such a nasal sound in the word "haitz" "rock" (cf. Roncalese "aitz").
Alternative theories.
Basque-Iberism.
The theory of the Basque-Iberism claims that there is a direct relationship between the Basque language and the Iberian language, meaning either that Basque evolved out of the Iberian language, or that its precursor belonged to the same language family. The first author to suggest this theory was Strabo in the 1st century BC (at a time when the Iberian language was still spoken); he asserted that the Iberians and the Aquitanians were similar physically and that they spoke similar languages and had similar customs.
The German linguist Wilhelm von Humboldt proposed, in the early 19th Century, a thesis in which he stated that the Basque people were Iberians, following some studies that he had conducted.
Others claim there is not a direct connection, including Koldo Mitxelena who claims the similarities between Iberian and Basque are attributed solely to the relationship of vicinity, and not to any kinship.
Caucasian origin.
Some researchers have propounded the similarities between the Basque language and the Caucasian languages, especially the Georgian language.
The comparison between the matrilineal and patrilineal DNA of the native peoples from the Basque Country and Georgia has allowed the discovery of significant differences. The hypothesis that related both populations is only based on the typological similarities, which is never a good marker of linguistic kinship. These superficial similarities in the linguistic typologies do not seem to accompany a genetic relation at a population level. The possible relation between Basque and the languages of the Caucasus is denied by authors such as Larry Trask, who stated that the comparisons were wrongly made, given the fact that the Basque language was compared with several Caucasian languages at the same time.
Old European.
These theories are based on the Old European hydronymy, assuming that the first inhabitants of Europe spoke a common tongue or languages of the same language family. This theory is not accepted by most linguists, who believe that, in a territory as large as Europe, more than one language had to be spoken.
In January 2003, the Spanish edition of the popular science magazine "Scientific American" published a study conducted by Theo Vennemann, where he concluded:
Vennemann:
According to Vennemann, the Proto-Basque language (or a language family from which the Basque language originated) was the linguistic stratum in which the Indo-European languages later settled. He found, among other examples, the Basque words ""ibai" (river) and "ibar" (bottom) to repeat continuously in European rivers, or the word "haran"" (valley) in toponyms such as Val d'Aran, Arendal, Arundel, Arnach, Arnsberg, Aresburg, Ahrensburg, Aranbach or Arnstein.
The Vennemann theory has been criticized by Basque scholars and it is not accepted by most linguists.
Specifically, Trask, after many pointed critiques of the methods employed, affirmed that Vennemann had found an agglutinative language, but with no relation to the Basque language, and that probably it is simply the Indo-European language, as many other linguistic scholars agree.
Joseba Andoni Lakarra, a researcher of the Proto-Basque language, criticizes the thesis of Vennemann, saying, like Trask, that he identifies modern Basque roots that are not related to the archaic Basque. In the same way, Lakarra says that, despite Basque now being an agglutinative language, there are reasons to believe that previously it was not so.
Roman records.
The early story of the Basque people was recorded by Roman classical writers, historians and geographers, such as Pliny the Elder, Strabo, Ptolemy and Pomponius Mela. The present-day Basque Country was, by the time of the Roman arrival in the Iberian Peninsula, inhabited by Aquitanian and Celtic tribes. The Aquitanians are also known as the "Proto-Basque people", and included several tribes, such as the Vascones, who were located at both sides of the western Pyrenees. In present-day Biscay, Gipuzkoa, and Álava were located the Caristii, Varduli, and Autrigones, whose origin is still not clear. It is not known if these tribes were of Aquitanian origin, related to the Vascones, or if they were of Celtic origin. The latter seems more likely, based on the use of Celtic and Proto-Celtic toponyms by these tribes. These tribes would have then gone through a Basquisation, caused by progress of the Aquitanian tribes on their territory.
Strabo in the 1st century AD reported that the "Ouaskonous" (Vascones) inhabited the area around the town of Pompelo, and the coastal town of "Oiasona" in Hispania. He also mentioned other tribes between them and the Cantabri: the Varduli, Caristii, and Autrigones. About a century later, Ptolemy also listed the coastal "Oeasso" beside the Pyrénées to the Vascones, together with 15 inland towns, including Pompelon. Pompelo/Pompelon is easily identified as modern-day Pamplona, Navarre. The border port of Irún, where a Roman harbour and other remains have been uncovered, is the accepted identification of the coastal town mentioned by Strabo and Ptolemy. Three inscriptions in an early form of Basque found in eastern Navarre can be associated with the Vascones.
However, the Vascones appear to have been just one tribe within a wider language community. Across the border in what is now France, the Aquitanian tribes of Gascony spoke a language different from the Celts and were more like the Iberi. Although no complete inscription in their language survives, a number of personal names were recorded in Latin inscriptions, which attest to Aquitanian being the precursor of modern Basque (this extinct Aquitanian language should not be confused with Occitan, a Romance language spoken in Aquitaine since the beginning of the Middle Ages).
Historiography.
Tubalism.
Between the 14th and 15th century, a series of historical legends were created with the objective of defending the singularity of the Basque people and their Fuero system, which regulated the relations between the Basque territories and the Crown. Among these legends are the "Basque-Iberism", the "Basque-Cantabrism", and "The Battle of Arrigorriaga". These legends were used in a context of political vindication. In the 19th century, the Basque nationalists would use these legends as the basis for their vindications.
Tubalism and Basque-Iberism.
Developed by Esteban de Garibay and Andrés Poza, this legend states that the Basque people are direct descendants of Tubal, grandson of Noah, fifth son of Japheth. According to the legend, Japheth and his tribe, the Iberians, departed to the Iberian Peninsula, settling between the Pyrenees and the river Ebro, right after the confusion of languages in the Tower of Babel.
Then, the Basque language would be one of the 72 languages that were created as a punishment of God after the Tower of Babel.
Basque-Cantabrism.
It is based on a historical and geographical distortion of the Cantabrian Wars, based on a manuscript gloss that Cristóbal de Mieres, secretary of Lope García de Salazar (1399–1476) introduced on a 1491 copy of "Las bienandanzas e fortunas". This legend makes the Vascones the protagonists of these wars.