Xamo is a rare surname of Cimbrian origin, characteristic of Veneto, in particular of the historical area of the Cimbri: the Altopiano dei Sette Comuni (in the province of Vicenza) and the Lessinia (in the province of Verona). The spelling with an initial X reflects an orthographic convention of Cimbrian and of old Venetan, where the X represents a sound similar to the Italian Z, so that Xamo is pronounced approximately Zamo.

The Cimbri are an ancient ethnic-linguistic minority of Germanic origin, settled in the high areas of Veneto and Trentino since the Middle Ages (12th-13th centuries), which preserved until recent times a language of its own, Cimbrian, derived from Middle High German. Many Cimbrian surnames retain archaic Germanic features and tend to present spellings unusual for standard Italian (X, K, endings in -ele, -erle, -ene). The precise etymology of Xamo is not documented in the classic Italian onomastic repertoires, but it could go back to a medieval Germanic anthroponym or nickname. To go deeper, it is advisable to consult the parish archives of the Altopiano of Asiago or of Lessinia, where the Cimbrian surnames appear recorded from the medieval period.