Díaz is a common Spanish surname meaning "son of Diego". The name accounts for ~0.74% of the Spanish population, ranking 14th most frequently found surname in both 1999 and 2004 (Mateos & Tucker 2008, OcioTotal 1999). Compare this to the most popular Spanish surname of those years, Garcia, which accounted for ~3.48% of the population.
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Díaz is a common Spanish surname meaning "son of Diego". The name accounts for ~0.74% of the Spanish population, ranking 14th most frequently found surname in both 1999 and 2004 (Mateos & Tucker 2008, OcioTotal 1999). Compare this to the most popular Spanish surname of those years, Garcia, which accounted for ~3.48% of the population.
Variants and related names
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 (OcioTotal 1999). However, a 2008 in-press academic manuscript about Spanish naming in 2004 suggests otherwise, listing statistics for "Diaz" and "Diez" separately (Mateos & Tucker 2008).
In relation to descent from the Biblical names James and Jacob, it has been surmised that Diaz is a corruption of Diego from Iago (Smith 1986). A second source suggests Diaz as being derived from a Gothic form of the paternal genitive of Dia, as in "Dia's child", or Diag, Diago or Diego (Dixon 1857).
Usage
Díaz and the angelicized form Diaz appear to be surnames only, without evidence for use as given names. Use of Díaz may arise through Anglicization of Portuguese language Dias, as in the case of Bartolomeu Dias.
Many examples of the surnames Díaz exist among historically notable people as a patronymic of Diego. Among the earliest such examples is El Cid, whose real name as Rodrigo Díaz de Vivar, and whose father's given name was Diego (Catholic Encyclopedia 1913).
There is at least one instance of use as a single name, the former Norwegian rap artist Diaz, who was born to a Spanish father and Norwegian mother; his birth name was "Andrés Rafael Díaz Rosa".Fact: date=April 2008
Frequency
In Latin America Díaz was among the top 25% of surnames in use based on a study conducted in 1987 by the Institute for Genealogy and History for Latin America (De Platt 1996, pages 31–32).
Spanish surnames, including Díaz, are found more abundantly in Southern Italy than other non-Italian surnames as a result of the domination of Italy by Spain during the 17th Century (Fucilla 1949).
The following matrix contains available information on the frequency of this surname in various countries across a span of years.
Reference codes, see References]]: (a)=OcioTotal 1999, (b)=Mateos & Tucker 2008, (c)=Longley, et al., (d)=United States Census Bureau 1995, (e)=United States Census Bureau 2000
Several assessed countries have shown no instances of this surname, among these being Northern Ireland, Republic of Ireland and Scotland (Bowie 2003; Longley, et al.).
Transliteration
It has been noted that Díaz may be subject to transcription errors and mistaken as Eliaz, which may subsequently be equated with Heliaz, in manuscripts dating from the 15th Century, the same holding true for Dias, Elias and Helias (Carr 1999).
