HeyrieuxHeyrieux is a commune in the Isère department in southeastern France.WWW Official SiteToponymyAs with many polysyllabic Arpitan toponyms or anthroponyms, the final -x marks oxytonic stress, whereas the final -z indicates paroxytonic stress and should not be pronounced, although in French it is often mispronounced due to hypercorrection.Twin townsHeyrieux is twinned with: Busnago, Italy, since 1999