The only free and comprehensive online etymological dictionary of the Spanish language
Pago (2) (Surname)
From Basque pago "beech," Medieval Basque bago. From Latin fagum 'id.' (see haya (1)).
Real Academia Española. Diccionario de la lengua española. Online. 23rd ed. Madrid: Espasa Calpa. 2014. http://www.rae.es/.
Sihler, A. New Comparative Grammar of Greek and Latin. Oxford University Press. 2008.
Trask, R. L. Etymological Dictionary of Basque. University of Sussex. 2008.