According to Emidio De Felice, the set of surnames such as Ausili, Ausilia, Ausilio, together with variants such as Auxili, Auxilio, Oxilia and the patronymic form D'Ausilio, is widespread in various regions of Italy with well-differentiated characteristics: the forms with -s- are typical of the Neapolitan area, Oxilia is concentrated especially in Liguria, and Auxili appears in the Marche. All of them derive from the personal names Ausìlio (masculine) and Ausìlia (feminine), documented already in Late and Medieval Latin as Auxilius, Auxilia and also Oxilia. These names have a clear auspicious and gratulatory value, since they come from the Latin noun auxilium (plural auxilia), meaning "help", "aid" or "support", especially in the family sphere, so the name alluded to a person considered a "blessing" or support for the group.

From the linguistic point of view, some variants reflect phonetic phenomena peculiar to the Romance languages, such as the shift au > o, which explains forms such as Oxilia in Liguria, while others preserve Latinising spellings such as Auxili or Auxilio. The use of this name is documented in old sources —for example, in medieval texts where it appears as a personal name in ecclesiastical contexts—, which confirms its early diffusion in the Christian sphere before becoming fixed as a hereditary surname.

In Argentina, these surnames arrived with Italian immigration and today present a moderate presence: Ausili (with several hundred people in provinces such as Buenos Aires, the City of Buenos Aires, Mendoza and Santa Fe), Ausilio (also concentrated in Buenos Aires and Santa Fe) and Oxilia (with presence in Buenos Aires, CABA and Chaco) are the forms currently registered. On the other hand, variants such as Ausilia, Auxili, Auxilia, Auxilio or D'Ausilio do not appear in the current databases, which may be due to their low frequency or to orthographic transformations in the migratory process. Taken together, these surnames preserve a deeply symbolic meaning, linked to the idea of help and family support, reflecting naming practices peculiar to the Latin and medieval Christian world.