Pili is specific to Sardinia, with the exception of Sassari, Pilia is typical of the Cagliari area and low of the Nuoro area, Piliu, very rare it would seem to be Sassari, Pilo, much more widespread, is typical of Sassari with probably secondary strains in Sicily, they should derive from dialectal forms of the term hairy, but it is also possible that they derive from the Latin cognomen Pilo-Pilonis. Pili and Piliu can also derive from contractions of the Sardinian name Pilimu (Priamo).
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