From Wiktionary, the free dictionary
Likely a borrowing from Old Italian alcuno.[1] Doublet of alicunu and algunu.
alcunu m
- (Logudorese, rare) someone
- Synonyms: (uncommon) algunu, (obsolete) alikis, calchiunu
- ^ Wagner, Max Leopold (1960–1964) “alicunu”, in Dizionario etimologico sardo, Heidelberg