The scholars consulted agree that the surname Oddi is of anthroponymic origin, deriving from Germanic personal names such as Oddo, Otto, Oddone, or Ottone. These names trace back to a Germanic base built on the element audha-, meaning "wealth" or "power," which was widely used in early-medieval onomastics.

F. De Laurentiis highlights the existence of a double tradition in Italy: one of Lombard origin, reflected in the form Oddo, and another of Germanic root — Alemannic or Bavarian — present in the form Otto. E. Rossoni confirms this Franco-Lombard origin and documents its use throughout the medieval period, noting that these forms evolved into several derived surnames sharing the same onomastic root. Both scholars connect the surname's distribution to the Veneto region.

It is also recorded that the surname derives from the first names Oddo, Otto, and Odo, all of Germanic origin, consistent with the broader picture outlined above.