Diaz family background shows that this is a hispanic surname. It has actually two possible origins. The very first is the Latin "dies", which means days. Diaz ancestry indicates that this lock may also derive from the Hebrew and also mean, "son of Iago" or "son of Diego", definition son of James or Jacob. That is related to the lock Diego. Diaz ancestry shows that the name is spelled through a "z" in Spanish-speaking countries, while the is spelled as Dias in Portuguese-speaking countries.