Perassi is typically Piedmontese, from Barge in the Cuneo area and from Scalenghe in the Turin area. Perasso, on the other hand, is specific to Genoa, Perazzi has a nucleus in Milan, one in the Verbanese and one in the Piacenza area, with presences also in the Florentine and Roman, Perazzini has a stock in Verona and Casaleone in the Verona area, one in Rimini in particular, and in Sant'Arcangelo di Romagna, San Giovanni in Marignano, Riccione, Bellaria and Igea Marina in the Rimini area, and one between Viterbo and Rome, in Rome and Lubriano in the Viterbo area, Perazzino, almost unique, is from the Viterbo area in the area that borders the Terni area, Perazzo has a stock in the Novara area, one in Liguria, especially in the east and in the Parma area, and a stock in the Salerno area. Petrassi has a stock in Rome, San Cesareo and Zagarolo in Roman and one in the Cosenza area in San Marco Argentano, Petrasso is specific of the Cosenza area, of Montalto Uffugo and of San Marco Argentano, they should all derive, directly or through hypocorisms, from a dialectal variation of ac forms growing or disparaging of the name Petrus.
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