According to Bertoldi and Terracini, Paleo-Sardinian has similarities with the Iberic languages and Siculian; for example, the suffix -"ara" in proparoxytones indicated the plural. Terracini proposed the same for suffixes in -', -/"ànna"/, -/"énna"/, -/"ònna"/ + ' + a paragogic vowel (such as the toponym "Bunnànnaru"). Rohlfs, Butler and Craddock add the suffix -' (such as the toponym "Barùmini") as a unique element of Paleo-Sardinian. Suffixes in /"a", "e", "o", "u"/ + -"rr"- found a correspondence in north Africa (Terracini), in Iberia (Blasco Ferrer) and in southern Italy and Gascony (Rohlfs), with a closer relationship to Basque (Wagner and Hubschmid). However, these early links to a Basque precursor have been questioned by some Basque linguists. According to Terracini, suffixes in -', -', -', and -' are common to Paleo-Sardinian and northern African languages. Pittau emphasized that this concerns terms originally ending in an accented vowel, with an attached paragogic vowel; the suffix resisted Latinization in some place names, which show a Latin body and a Nuragic suffix. According to Bertoldi, some toponyms ending in -' and -/"asài"/ indicated an Anatolian influence. The suffix -/"aiko"/, widely used in Iberia and possibly of Celtic origin, and the ethnic suffix in -/"itanos"/ and -/"etanos"/ (for example, the Sardinian "Sulcitanos") have also been noted as Paleo-Sardinian elements (Terracini, Ribezzo, Wagner, Hubschmid and Faust).