This is the 3012th most frequent Spanish word.
diaz
The word "diaz" does not have a specific meaning in Spanish; it is likely a proper noun, such as a surname.
In this sentence, 'Díaz' is used as a proper noun referring to a surname.
El apellido Díaz es muy común en España.
The surname Díaz is very common in Spain.
Here, 'Díaz' is part of a proper noun signifying the name of a street.
Visité la calle Díaz de Espada en mi viaje a Cuba.
I visited Díaz de Espada Street during my trip to Cuba.
In this instance, 'Díaz' represents the author mentioned with this surname.