Hello Mr. Otero, If you are the same person as the G2a, Kit #187510, in the New Mexico DNA Project then I see no close matches for you in their project. I am certain you are aware of the fact that familial surnames often have changed over the course of centuries and the possibility is that your Otero surname may have been taken from a maternal line somewhere back in your ancestry. It may indeed be your paternal lineage surname and that you are simply descend from a genetically different Otero line. Finally, I would add that G2a has recently been found in Spain dating back 7,000 years ago into the Neolithic Period. The G2a haplogroup may have been one of the earlier population groups in Spain. You might find this link interesting to read:http://dienekes.blogspot.com/2011/11/y-haplogroups-e-v13-and-g2a-in.htmlhttp://dienekes.blogspot.com/2011/11/y-haplogroups-e-v13-and-g2a-in.html You also might want to consider deep clade SNP testing for your haplotype to know more specifically your subclade and maybe find some clues to your ancient roots.