"Its name most likely comes from a transcription error of the Sardinian mapmakers. In patois, ""vah"" which means ""ford"", was understood by the clerks of the Kingdom of Piedmont-Sardinia, by ""vatz"" which in turn translates as ""cow"". The paved passage is post-1949, and probably the work of the French Alpine troops. Before this layout the path passed the right bank, as several mountain guides and topoguides from the inter-war period attest."