Diego is a Spanish masculine given name. It derives from a re-analysis of Sant Yago ("Saint Jacob"), viz. in reference to Saint James the Greater, re-analysed as San Diego. In today's Spanish-speaking countries, Diego and Santiago are common as given names; Diego, Santiago and Sandiego are found as surnames. The forms Tiago, Thiago, Diago and Diogo are seen mostly in Portuguese speaking (Lusophone) countries. The name Diego can also be found in Italy.