Pre-Indo-European hypothesis

There is toponymic evidence suggesting that the Paleo-Sardinian language may have had connection to the reconstructed Proto-Basque and to the pre-Indo-European Iberian language of Spain.[4] Eduardo Blasco Ferrer concluded that it developed in the island in the Neolithic as a result of prehistoric migration coming from the Iberian peninsula.[5] The author in his analysis of the Paleo-Sardinian language find only few traces of Indo-European influences (*ōsa, *debel- and perhaps *mara, *pal-, *nava, *sala), possibly introduced in the Late Chalcolithic through Liguria.[6] Similarity between Paleo-Sardinian and Ancient Ligurian were also noted by Emidio De Felice.[7]

Bertoldi & Terracini[citation needed] propose that the common suffix -ara (with stress on the antepenult) was a plural marker, and indicated a connection to Iberian or to the Paleo-Sicilian languages. Terracini claims a similar connection for the suffix -ànarV, -ànnarV, -énnarV, -ònnarV, as in the place name Bonnànnaro. A suffix -ini also seems to be characteristic, as in the place name Barùmini. A suffix or suffixes -arr-, -err-, -orr-, -urr- have been claimed to correspond to Numidia (Terracini), to Iberia (specifically Basque, Blasco Ferrer), to the south of Italy and Gascony (presumably Basque, Rohlfs), and to Basque (Wagner, Hubschmid).

The non-Latin suffixes -ài, -éi, -òi, -ùi survive in modern place names based on Latin roots. Terracini sees connections to Berber. Bertoldi sees an Anatolian connection in the endings -ài, -asài (similar claims have been made of the Elymians of Sicily). A suffix -aiko is also common in Iberia and may have a Celtic origin. The tribal suffix -itani, -etani, as in the Sulcitani, has also been identified as Paleo-Sardinian.