A. Bongioanni, E. De Felice and E. Rossoni agree that the surname Grazia derives from the personal names Grazia, Grazioso and Graziano. These names are partly connected to the Latin cognomen Gratius, derived from gratus (“pleasing,” “welcome,” or “dear”), but their widespread use is mainly linked to the Christian concept of grace, understood as divine favor and spiritual blessing.

A. Bongioanni associates the surname with the rich tradition of Marian devotion, particularly with titles such as Mater Gratiae (“Mother of Grace”). In this context, the name acquired a strong religious significance and was commonly bestowed as an expression of faith, gratitude and hope for divine protection.

The surname belongs to a broad family of related forms that developed throughout Italy, including Di Grazia, Delle Grazie, Graziuso, Graziussi and Grazzini. These variants reflect regional linguistic developments while preserving the same underlying root connected with grace and favor.

According to the authors, Grazia is found throughout Italy, although it is especially frequent in Emilia-Romagna. The patronymic forms Di Grazia and Delle Grazie are particularly characteristic of southern Italy, while Graziussi is associated with Veneto and Grazzini is especially common in Tuscany.

E. Rossoni places the surname Grazia primarily in the areas of Bologna and Modena and notes that, in some cases, it may also have originated through the shortening of compound names such as Graziadei. Overall, the surname reflects a blend of classical, religious and devotional traditions that have shaped Italian naming practices since the Middle Ages.