Pirini is specific to the area that includes the Bolognese, the Ravenna, the Forlì and the Rimini, it should be a hypocoristic dialectal form of the name Piero, probably brought by the progenitor, of this use we have an example in Vignola (MO) in the 1583 in a: "Proclamation for the denunciation of the evildoers that have caused damage to the garden of Pirino dal Sasso placed in the pits of the castle and contiguous to the walls.".
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