Very rare it seems originating in the Piacenza and South Milanese, it could derive from a dialect Rai (Ragli) indicating a confluence of roads, probably by a celticho Rhaudi, but could also derive from a Latin vercellae plural of raudius (famous The fields Raudii near Vercelli, where the Roman consul Mario in 105 BCE defeated the Cimbri. Additions provided by Giacomo Ganza/Villa di Tirano (SO) The surname Rai is difficult to interpret. It could not be excluded also an italianization of a surname French or Spanish type Ray. . It is certain that the Rai exist in the province of Piacenza at least from the second half of 800. From there some of them emigrated towards the end of that century starting from Pianello Val Tidone (PC).
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