The study of Martínez-Cruz et al. 2012 shows a distribution of Y-DNA haplgroups from Basques and surrounding regions, from Spain and France. My focus is on the sublcade of R1b , R-L21, which is most common in the British Isles and Brittany, and until now it has not been much tested for in Iberia.
In some regions of Spain tested in this study it surpasses 20% of frequency. Here is the table for all haplogorups and samples. The regions corresponding to Spain and their R-L21 frequency are :
Southwestern Gipuzkoa, n = 13/57 = 22.81%
Roncal Valley, Navarra: n = 11/53 = 20.8 %
Alaba, n = 11/51 = 21.57%
Guipuzkoa, n = 9/47 = 19.15%
Central/Western Navarra, n = 9/60 = 15.0%
Bizkaia, Basque Country, n = 7/57 = 12.28%
La Rioja, n = 6/54 = 11.11 %
Western Bizkaia , n = 3/19 = 10.53%
Northwestern Navarra, n = 5/51 = 9.80%
Northern Aragón : n = 1/27 = 3.7%
Total : n = 75/476 = 15.76%
