Are the Basques a single and a unique population?

1. Aguirre, A.
2. Vicario, A.
3. Mazón, L.I.
4. Estomba, A.
5. Martínez De Pancorbo, M.
6. Arrieta Picó, V.
7. Perez Elortondo, F.
8. Lostao, C.M.