Whether Iberian and Basque are two languages of the same language family is still a much-debated question. Many experts on Iberian suspect that there is a relationship of some sort between Iberian and Aquitanian, a precursor of the Basque language. But there is not enough evidence to date to ascertain whether the two languages belong to the same language family or whether the relationship is due to linguistic borrowing. Lexical and onomastic coincidences could be due to borrowing, while the similarities in the phonological structures of the two languages could be due to linguistic areal phenomena (cf. the similarities between Basque and Old Spanish in spite of being languages of two different families). More scientific studies on Iberian language are needed to shed light on this question.