The surname Carraro and its numerous variants —such as Carrari, Carrer, Carriero, Carretta, Carretto, Carrara, among many others— originate in an old medieval trade name linked to the world of transport. According to E. De Felice, it derives from carràio or carraro, from the Late Latin carrarius and faber carrarius, terms that designated the one who drove carts (cartwright) or the one who built and repaired them. This trade was fundamental in the medieval economy, linked to trade, mobility and rural activities, which explains the wide diffusion of the surname.

Along the same lines, F. De Laurentiis and E. Rossoni agree on this occupational origin, highlighting that the surname is concentrated especially in northern Italy, and in particular in the Veneto. There it reaches its greatest frequency and presents local variants such as Carrèr, Carrièr or Carraretto. This strong regional concentration reflects the historical importance of the trade in these areas, where land transport and the craft production of vehicles were key activities.

For its part, the information gathered by Surnames in Italy broadens the picture by detailing the great diversity of derived forms and their geographical distribution, noting that a wide majority of the families with this surname are concentrated in the Veneto, especially in provinces such as Padua, Venice and Treviso. It also distinguishes related surnames but of different origin, such as Carrara, of toponymic base. Taken together, all the sources agree in noting a clear and well-defined origin in a medieval trade, which gave rise to an extensive family of surnames spread mainly in northern Italy.