Diaz is a common Spanish surname with multiple meanings in multiple languages. First found in Castile, where the name originated in the Visigoth period, the name accounts for about 0.17 % of the Spanish population, ranking as the 14th-most frequently found surname in both 1999 and 2004 compared to the most popular Spanish surname of those years.

Where does the last name diaz originate from? Okie... think carefully first, then make a decision:
The relevant information to answer the above question is: First found in Castile, where the name originated in the Visigoth period, the name accounts for about 0.17 % of the Spanish population, ranking as the 14th-most frequently found surname in both 1999 and 2004 compared to the most popular Spanish surname of those years. So, the answer is in Castile , where the name originated in the Visigoth period.