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Está completamente enganado.
"Diego is a Spanish male name derived from the Hebrew Yaʻăqōbh (Jacob), via the name of Saint James the Great (Sant Yago), re-analysed as Santiago and San Diego. The assimilation of the final t of Sant into the name is attested in other saints' names, including Spanish and Portuguese Telmo 'Elmo' (< Sant Elmo) and Slovenian Tilen 'Giles' (< Šent Ilen).

Diego is a very popular name in the Spanish-speaking world. In Brazil/Portugal, France and Italy it is a very widespread name as well (as are other Spanish names such as Fernando). For example: due to the Spanish influence from the days of the kingdom of Naples, on the death of king Alfonso I of Naples (also known as Alfonso V of Aragon) in 1458, a famous elegy was composed by one Diego del Castillo.[1]

The patronymic for Diego is Díaz in Castillian (used for example by Rodrigo Díaz de Vivar, better known as El Cid) and Dias in Portuguese. Like many patronymics, these have become common surnames in Spanish- and Portuguese-speaking regions. The form Diéguez is much less common; Diegues can be found in Portuguese-speaking countries. de Diego and Diego can also be found as surnames.

Medieval usage of different forms

During Medieval times, the names "Sant Yago", "Diago" and "Diego" seem to have coexisted.

"Sant Yago" is used, for example, in a letter by James II of Aragon dated 1300: "[...] maestro de la cavalleria de Sant Yago et de la dita orden [...]".[2]

"Diago" is recorded, for example, in "Et fue a casa del Rey. e mostrolo a don diago que era adelantado del Rey" (Fuero de Burgos, ca. 1240 [3])

The Cid's father was named Diego Laínez. Since the Cid is believed to have been born around 1040, the name Diego can be placed in Castile at the beginning of the 11th century

The name Didacus

Diego was translated into Latin as "Didacus" ("learned person"), which is retrospectively traced to the Greek Διδάχος, Didákhos, "teacher", from διδάσκειν, didáskein, "to teach". Thus, for example, the usual English language name for San Diego de Alcalá (after whom San Diego, California is named) is "Didacus of Alcalá".

This form, and its Spanish equivalent "Didaco", were most likely created in retrospect (that is, to translate Diego into Latin, as opposed to being the source of the name Diego). There are no mentions of Spanish people named Didacus during the Middle Ages. During those times, it was common practice to Latinize existing names, as in Ludovicus for Ludwig (Luis in Spanish).

Even so, some have insisted on deriving Diego from Didacus; nineteenth-century Spanish author Benito Pérez Galdós has a passage in his National Episodes Series 4 (Narváez) that reads:


Su nombre es Didaco o Yago, aunque vulgarmente lo llaman Diego. (His name is Didaco or Yago, but he is commonly called Diego.)


Cpts

Maria Benedita