I start with Hernan Rico in Spain in the 1500's. His son Pedro Gomez took the name "Duran y Chaves". Why?? I don't know yet. Late in the 1700's, One Pedro Duran y Chaves took the name "Otero", most likly because he was raised by a Pastor by the name of Otero that lived in Albuquerque.There is no connection between this Otero and the Otero's that became Governor of NM.