Diego is a masculine given name. It is believed to derive from the Greek διδαχη (didache), "teaching", then translated into the Latin word "Didacus" (in Modern English learned, cultured). Etymological evolution of the name shows that it may be eventually be originated from "Iakobos", then evolved into the Spanish "Yago" then Santiago ("Santiago"), and finally re-analysed as San Diego.Nowadays, the name Diego is popular in Spanish-speaking countries (Spain, Uruguay, Chile, Mexico) as well as in Italy. Diego, Santiago and Sandiego are sometimes found as surnames. The forms Tiago, Thiago, Diago and Diogo are seen mostly in Portuguese speaking (lusophone) countries.