Diaz surname meaning

Diaz is Spanish for a patronymic from Diego—the medieval personal name Didacus that English speakers usually meet as Diego. The surname marks "Diego’s son" or "of Diego’s line," parallel to other Iberian -az/-ez formations.

It is a parent's-name surname. Sephardic families sometimes adopted Díaz at conversion and kept it later; that history does not change the word’s patronymic sense. US Census spelling is usually Diaz without the accent. The short family gloss is what matters for this catalog.