 The name of Saint-Arnac appears in 899 as "villare Centernacho", followed by "Centernacum" in the 12th century.But already in 1137, Ermengaud de So gives the name "Sent Ernach", which later becomes "Sant Arnach" or "Sanctum Arnachum", and then "Saint-Arnac" or "Saint-Arnach" in French.The original name, "Centernach", is probably that of a landowner, followed by the suffix "-acum", which may be either