The surname Airaudi / Airaudo / Airoldi / Araldi / Airaldi belongs to a broad onomastic family of Germanic origin, widespread in northern Italy. According to E. De Felice, it derives from the medieval personal name Airaldo or Araldo (also Airòldo, Aròldo), introduced to Italy by the Lombards and later reinforced by Frankish influence. This name is documented from the Early Middle Ages and is related to historical figures such as Arioaldo (7th century), which shows its antiquity and prestige.

From the etymological point of view, the original Germanic name (Hariowald) is composed of haria- ("army, people in arms") and waldan ("to command, to rule"), meaning "commander of the army" or "leader of the troop". Over time, especially under Frankish influence, the name became associated also with the term araldo (herald), that is, a high-ranking official with military, diplomatic and ceremonial functions.

As for its diffusion, E. De Felice notes that these forms are typical of northern Italy: Airoldi and Araldi are frequent in Lombardy; Airaudo and Ariaudo are peculiar to Piedmont; and patronymic variants such as Da Ròld appear in the Belluno area.

For his part, E. Rossoni confirms the Lombard origin, proposing the form Ariovaldo, with the same meaning of "chieftain" or "the one who leads the army". He also adds that in the Middle Ages this name was frequently given to the firstborn of important families as a name of good omen, reinforcing its symbolic value.

Taken together, both interpretations agree in pointing to a Germanic anthroponymic origin linked to the military sphere and to power, with a strong presence in northern Italy and an evolution that gave rise to numerous regional variants.