I found that the surname Muttiron is widespread in ancient Insubrian Celtic-speaking areas, such as the provinces of Varese, Sondrio, and Como, while surnames made to derive from ‘motta’ in the sense of ‘mound’ are widespread mainly in Lombardy, Piedmont, Liguria, an area of Trentino-Veneto (Valsugana), and Emilia-Romagna. There are also nuclei in the South. I started from the hypothesis that there was a considerable possibility that the original word belonged to a continental Celtic language, in our case Cenomanian, Insubre or Lepontian or other Cisalpine Celtic languages, and that there might be a correspondence with some language of the so-called Celtic Fringe. Starting with variants of ‘motte,’ such as ‘mutera, motera, motaron, muttiron,’ I saw that there was a remarkable similarity to a Scottish and Irish Gaelic term, mothar, which covers a remarkable range of meanings, from marshy area to Celtic fortress ruin on a hill, from terrifying howl to a dark, misty mass, to a group of trees and tangle of bushes. Where linguistics did not reach, we were helped by folk tradition, which showed us how the structural elements of stories about the motte in Veneto fall within the semantic fields examined by Gaelic and Indo-European linguistics: these stories link the motte to the otherworld, to mystery, to ancient heroes and their banquets, to Dionysian cries and the Sabbath, to the sounds of ancient battles and long dead soldiers buried there, to supernatural creatures dressed in red and to those that inhabit streams, springs, swamps, and forests.