Is wonderful to see how many Quintanillas are spred all over the world.
As you probably know the name is original from Spain, concretely a region called Castilla. There are many villages in this area like: Quintanilla de Onesimo.
My granfather was from Castilla, and he fought in the Spanish Civil War where he lost a brother. This brother is missing and we don´t know if he is death or could be alive. If you have any ancestor from Spain or any other info regarding my granfather brother, please let me know.
Hope we can keep in touch because Quintanilla is not such a common surname in Spain.