Great question! I looked up some of the information and it is impressive. Amongst the names are Julio Salinas (capped for Spain), Bixente Lizarazu (capped for France), Aitor López Rekarte (Spain), more players I cut and pasted from Wikipedia:
http://en.wikipedia.org/wiki/Basque_..._football_team
José Ramón Alexanko
Rafael Alkorta
Mikel Alonso
Xabi Alonso
Zigor Aranalde
Luis Arconada
José Mari Bakero
Txiki Beguiristáin
AgustÃ*n Sauto Arana
Mikel Arteta
José MarÃ*a Belauste
Biurrun
Igor Jáuregui Iraola
Daniel Ruiz Bazán
Asier del Horno
Joseba EtxeberrÃ*a
Andoni Goikoetxea Olaskoaga
Jon Andoni Goikoetxea Lasá
Guillermo Gorostiza Paredes
Alejandro Basurto
Julen Guerrero
José Ãngel Iribar
Javier Irureta
Aitor Karanka
Ivan Campo
Jose Antonio Larrañaga
Bixente Lizarazu
Roberto López Ufarte
Gaizka Mendieta
Pablo Orbaiz
Pichichi
Julio Salinas
Ismael Urzaiz
Javier Urruticoechea
Francisco Yeste
Andoni Zubizarreta
Javier de Pedro
Iñigo Idiakez
Aitor López Rekarte