Likely a variant of Diego, a Spanish name traditionally linked to James or Santiago.
Diago is a variant spelling of Diego, one of the great names of the Spanish-speaking world. Diego is the Spanish evolution of Santiago, itself a contracted form of Santo Iago — Saint James. The underlying name James, or Iacobus in Latin, derives from the Hebrew Yaakov, meaning "one who holds the heel" or, more metaphorically, "supplanter," the name given to the patriarch Jacob in the Book of Genesis.
Few names carry so layered a history: from a wrestling patriarch to a Roman tax collector turned apostle to a Spanish saint whose shrine at Santiago de Compostela drew pilgrims across medieval Europe. Saint James the Greater — Santiago — became the patron saint of Spain, and his name spread with Spanish colonization across Latin America, where Diego became a beloved given name in its own right. Among its most famous bearers: Diego Velázquez, the seventeenth-century Spanish master whose paintings of light and royal portraiture defined an era; Diego Rivera, the Mexican muralist whose enormous frescoes turned political history into visual epic; and Diego Maradona, the Argentine footballer whose genius made him a mythological figure in global sport.
Diago, with its slight orthographic variation, softens and personalizes the name, giving it a creative individuality while keeping all the historical and cultural weight of its origin. It is a name with centuries of greatness behind it and a quietly distinctive face.