Perosa is typically Venetian and Friulian, Perossa is specific to Trieste and Muggia in Trieste, and can hardly derive from the various toponyms, Perosa del Piemonte, and it is equally unlikely that it is linked to the archaic name of Perugia. additions provided by Giovanni Vezzelli PEROSA - Non-twin form of the surname PEROSSA typical of Trieste. The forefather was a Iacomo de Petroxa documented in 1426, also called Iacomo de Peroxa. The surname Perossa is a matronymic from the ancient female name Petrossa / Perossa, variants of Petruzza / Peruzza diminutive affective of Petra / Pera, feminine of Petro / Pero = Pietro. Source: M. Bonifacio, surnames of Trieste, 204.
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