I would like to know the nationalities and meanings for the last names of Saenz

Question:

I would like to know the nationalities and meanings for the last names of Saenz and Castillo??

Best Answer - Chosen by Asker: Both are Latin names and could come from any number of countries. To find the exact nationality, you need to trace the person, and find where the ancestor came from.
Not ALL names have a "meaning"... a name is really nothing more than a form of a label. In medieval times, there were so few people that last names were not even needed. The custom of surnames simply came about as a way to sort out 500 Juans or Williams, so forth.