The Basque people, who primarily inhabit the region spanning northern Spain and southwestern France, have been found to have a higher amount of Neanderthal DNA compared to many other populations. Studies have suggested that Basques, on average, may have around 5-7% Neanderthal DNA in their genomes.
It’s important to note that these percentages can vary among individuals, and the estimation is based on genetic studies that analyze the presence of specific Neanderthal genetic markers in modern human populations. Additionally, advances in genetic research may refine our understanding of these estimates in the future.