The surname Olmi / Olmo is of toponymic origin and derives from place designations linked to the presence of elms. On this point E. De Felice and E. Rossoni agree, noting that these are names formed from place names such as Olmo or Olmi, very diffused in northern and central Italy, used to identify localities or inhabited cores characterized by the abundance of these trees.

Along the same lines, E. Rossoni adds that the surname may also have originated directly as a byname linked to the place of residence, thus reinforcing its descriptive and geographical character. In this way, the surname reflects an environmental reference typical in the formation of Italian surnames, based on elements of the landscape.