[5] To reproduce the evolution of the toponym, it is necessary to talk about the Corografia Bergomense (1880) that collects, in a chronological order, all the documents which cite the different municipalities in the province of Bergamo.

In the majority of cases the geographical names are connected with the characteristics of the environment surrounded places and this is true also for Suisio which has an assonance with the river Seveso.

The glaciers, during their very slow movement, carried here boulders of rocks and rubbles and they shaped the valleys and the level ground.

Melting glaciers and torrential rain made the level of rivers and streams raise and covered the Island of Bergamo with a wide swamp called Gerundo.

As declared in the Concession of DPR 14 July 1960, it represents two towers (of one in the other) of two floors crenellated supported by a light blue and silver strip.

On 18 April 1959, the mayor Giacomo Tasca decided to approve an emblem ex novo without waiting the necessary research in the historical archives of Bergamo and Venice.