The Argentine genealogist Hugo Alloa —a highly respected researcher within the field of Piedmontese genealogy and Italian immigration in Argentina, now deceased— devoted many years to reconstructing the history of the Alloa families and other branches linked to western Piedmont. Through his blog and various genealogical works, he gathered historical documentation, parish records and family reconstructions that made it possible to preserve a very valuable memory of this old Piedmontese surname.

His research shows that the surname Alloa has very ancient roots in western Piedmont, especially in areas linked to Carmagnola, Cuneo, Pinerolo, Vigone and other historical localities of the old Savoyard space. In the documents there also appear old and related forms such as:

• Allodio
• Alodio
• Allodi
• Alloi
• Allo

These variants allow us to observe a long linguistic evolution of the surname over the centuries.

One of the most interesting hypotheses on the origin of the surname was proposed by the Italian scholar E. Rossoni, who notes that Alloa and Alloi, both extremely rare and characteristic of western Piedmont, could derive from the medieval French term alleu —pronounced approximately "allö"—. This term designated a free land, not subject to the feudal authority of a lord. According to Rossoni, the surname would have originally arisen as a nickname applied to people coming from "free" or allodial territories.

Allodium ↔ Alleu (allö)

The hypothesis is especially solid because it finds strong support in old Italian and Piedmontese dictionaries. In one of them, the term Allodio is defined as:

"quel predio che possedevasi in piena, libera e perpetua proprietà, esente da ogni peso reale e da ogni altra servitù personale"

That is, a property held in full freedom, free of feudal obligations or servitudes. The dictionary also explains that the "predio allodiale" was clearly distinguished from the feudal, the censual and other forms of medieval tenure.

Allodium = free non-feudal property

However, it is important to distinguish the different linguistic layers of this evolution. The term allodium belongs originally to Medieval Latin and was widely used in notarial and legal documents of the Middle Ages. From it derives the legal Italian allodio, also used in Piedmont in legal and administrative texts. It is not, therefore, a properly Piedmontese dialectal word, but a medieval legal term of Latin origin.

Allodium (Medieval Latin) → Allodio (legal Italian)

The connection with the surname seems to strengthen precisely in western Piedmont thanks to the parallel with the medieval French alleu. For centuries, this region was deeply influenced by the Franco-Provençal, Occitan and medieval French languages, especially in the areas near Savoy and the Alps. In that linguistic context, the popular term alleu —pronounced "allö"— probably coexisted with the legal Italian form allodio.

That coexistence helps to explain much more naturally the phonetic evolution of the surname towards forms such as Alloi and Alloa.

Allodium (Latin) → Allodio (legal Italian) ↔ Alleu (medieval French, allö) → Alloi / Alloa

The various documented variants seem to preserve precisely the traces of that process:

• Allodium as the Latin legal root
• Allodio as the medieval Italian form
• Alleu as the medieval French adaptation
• Alloi and Alloa as Piedmontese dialectal forms

It is also possible that variants such as Allodi or Allo represent parallel branches that arose during the process of surname fixation in the Middle Ages.

Allodium → { Allodio, Allodi, Alloi, Alloa, Allo }

All this makes Alloa a particularly interesting surname from the historical point of view, because it probably did not arise simply as a family patronymic, but as a nickname associated with a concrete territorial and legal condition: belonging to free or allodial lands within the complex medieval feudal system.

Moreover, the strong concentration of these surnames and their derivatives in western Piedmont reinforces this interpretation even further, since that region was one of the Italian spaces where French and Occitan linguistic influence left a deep mark both in the toponymy and in numerous traditional surnames.

The surnames Alloati and Alloatti seem to belong to the same onomastic family related to Alloa, probably sharing a common root developed in western Piedmont. Although they are extremely rare variants, their historical geographical distribution and their linguistic characteristics suggest a connection with the medieval forms Allo, Alloi and possibly with the legal root allodium / allodio.

Allodium → Allodio ↔ Alleu (allö) → Alloi / Allo → Alloati / Alloatti

The endings -ati and -atti are relatively frequent in northern Italy and, especially, in Piedmontese and Lombard areas. In many cases they indicate:

• family descent,
• branches derived from an older surname,
• patronymic forms,
• or dialectal adaptations produced over time.

Within this logic, Alloati and Alloatti could originally be interpreted as variants derived from a base form Allo, equivalent to "the descendants of Allo" or "the family of Allo".

The oscillation between a single consonant and a double consonant —Alloati / Alloatti— is completely normal in old Italian documentation. Until relatively recent times, the spelling of surnames was not fixed and often depended on the priest or notary who wrote the deed, the local dialect, the family pronunciation, or even the degree of literacy of those declaring the surname. For that reason, apparently different forms could coexist within the same family or alternate between generations.

Another important element is the linguistic context of western Piedmont, a region historically influenced by Franco-Provençal, Occitan and medieval French. That linguistic mixture favoured numerous phonetic transformations and graphic variants in local surnames.

Although there is still no definitive documentary proof directly connecting Alloati and Alloatti with Alloa, the geographical coincidence, the rarity of the variants and the linguistic structure of the surnames make the relationship highly plausible.

Allodium → { Allodio, Allodi, Alloi, Alloa, Allo } → { Alloati, Alloatti }