Pogliaghi is very rare and typical of the Milan area, as well as Pogliani, which is however much more widespread, Poiaghi, absolutely rare, it would seem of the Sudmilanese, Poiago is almost unique, should derive from the toponym Pogliano Milanese (MI) or from toponyms disappeared as Polliago we have traces in a brief consignationis feuds in Arcagnago (MI) (near San Giuliano Milanese) of 1199: "... a mane de Zendatariis, in the Morandi meridians, in sero Sancti Ambrosii, upstream illorum del Polliago, dicitur Gera campus de Burgo ... ".
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