The Santos surname my family carry came from the Delos Santos surname from Gapan, Nueva Ecija, Philippines which is reflected on my and my brother's Birth Certificate.
Note: The Delos surname referred above is a substantiation of the Spanish "de" + "los" (proposition plus article); thus it is a connector particle similar to the German 'Von' or the Arabic 'Ibn'...
Also Santos (which literally means the 'Holy Ones') is a rather common surname in both Spain and Portugal, as well as in all territories that were once under their extensive colonial influence.