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Cognomen Vacher (Vache , Vacher ) , in the entire world, is a common last name. The last name Vacher is characteristic of France, where it is quite a common surname, Mauritius, where it is quite a rare surname, and Georgia. Measured by absolute frequency, it most frequently occurs in France, the United States, and India. Much less frequently, Vacher is the forename as well as the last name.