My QUINTANILLAs were from Santander, Spain. The earlist one I know of was an Andres de QUINTANILLA who married 22 Nov 1689 in Heras, Santander, Spain to Marcella de la SOTA. He was the son of Domingo de QUINTANILLA and Lucia de la SOTA. My ancestor was Josef Manuel de CASTANEDO, (1770-1819) was the son of Josef Felix CASTANEDOand Maria Manuela de QUINTANILLA, daughter of Joseph de QUINTANILLA and Marcella de la SOTA, son of Andres, the above mentioned. I would be very interested in what you have.