[1] There is minor evidence that Díez may be equivalent to Díaz, in the form of Spanish language listing of most frequent surnames in 1999 Spain.
[2] However, a 2008 in-press academic manuscript about Spanish naming in 2004 suggests otherwise, listing statistics for "Díaz" and "Díez" separately.
Díaz and the anglicized form Diaz appear to be surnames only, without evidence for use as given names.
Many examples of the surnames Díaz exist among historically notable people as a patronymic of Diego.
[5][full citation needed] As of 2014, 21.5% of all known bearers of the surname Díaz were residents of Mexico (frequency 1:132), 11.4% of Colombia (1:96), 9.1% of Argentina (1:108), 8.0% of Spain (1:134), 7.2% of Venezuela (1:96), 6.7% of the United States (1:1,242), 5.2% of Peru (1:142), 5.0% of Cuba (1:53), 4.6% of Chile (1:87), 3.1% of the Philippines (1:742), 2.9% of the Dominican Republic (1:83), 2.5% of Puerto Rico (1:33), 2.4% of Guatemala (1:155), 2.0% of Honduras (1:100), 1.4% of El Salvador (1:107), 1.3% of Nicaragua (1:103), 1.2% of Ecuador (1:293) and 1.0% of Paraguay (1:161).