Soriano just gives the nod, the guy doing the hard work is Txiki.. Which definitely sound like a basque name to me, like Iraola
Yes, he is Basque. Txiki is his nickname, means "Small". Used to play for Athletic rivals Real Sociedad, and moved to Barcelona with teammates Bakero and Lopez Rekarte.
As a curiosity, Iraola's and Begiristain's hometowns are 30km apart.