The surname Basile derives from the given name Basilio, which continues the Latin Basilius, itself adapted from the Greek Basíleios (Βασίλειος). This name was formed from basiléus (βασιλεύς), meaning “king,” and therefore carried the sense of “royal” or “regal.” Its widespread adoption in Italy was strongly influenced by the cult of Saint Basil the Great of Caesarea, one of the most important Fathers of the Greek Church in the 4th century.

According to E. De Felice, F. Miranda, S. Vannozzi, and other scholars, Basile is a patronymic surname that originally identified the descendants of a man named Basilio. Miranda notes that the underlying Greek roots convey ideas associated with royalty and imperial authority. Vannozzi adds that the surname became established around the 12th century and was reinforced by the popularity of several saints bearing the same name. De Felice also documents the Venetian form Baseg(g)io as a hereditary surname already recorded in Venice in 1261–1262.

The surname is especially common in southern Italy, where it reflects the long-lasting influence of Byzantine culture. G. Rohlfs highlights its strong presence throughout Calabria, Campania, and Sicily, linking it to the Greek form Vasilis (Βασίλειος), widely used in the Byzantine world. Related forms include Basili, more typical of central Italy (Marche, Umbria, and Lazio), Vasile, found mainly in the far south, and regional variants such as Baseggio, Basezzi, and Basez in northeastern Italy. In some southern dialects, particularly in Calabria and Basilicata, the initial B and V may alternate, explaining the coexistence of forms such as Basile and Vasile.

E. Rossoni also proposes alternative origins in specific cases. Some families may derive their surname from the place name Basiglio (near Milan), historically documented in the form Basilico, while in Basilicata the surname could occasionally be connected to the Latin term basilicus, meaning “governor” or “administrator.” Nevertheless, the prevailing interpretation remains the patronymic derivation from the personal name Basilio.

Taken together, the various interpretations agree that Basile is an ancient surname of Greek-Byzantine and Christian tradition, rooted in the personal name Basilio and associated with the concepts of royalty, authority, and prestige. Its strong concentration in southern Italy reflects the enduring influence of Byzantine culture and devotion to Saint Basil throughout the region.