I was in Belgium going to Antwerp and sometimes the French name -- Anvers -- was used. At least in e.g. Valais in CH cities that have dual names are shown with

I was in Belgium going to Antwerp and sometimes the French name -- Anvers -- was used. At least in e.g. Valais in CH cities that have dual names are shown with both, e.g. Sierre/Siders.