Peas is typical of Umbria and Lazio, Pisi is typically Emilian of Parma and Reggio Emilia above all, Piso is absolutely rare, all derive from nicknames related to the Latin word pisum (pea) or from the Latin nomen Piso (Pisonis) of which we have a example in Book XXXIV ° of the Naturalis Historiae of Pliny: "... monopodia Cneum Manlium Asia devicta primum invexisse triumpho his, quem duxit anno urbis DLXVII, Lucius Piso auctor est, Antias quidem heredes ...".
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