Étainhus is a commune in the Seine-Maritime department in the Normandy region in northern France. Étainhus is a farming village in the Pays d…Étainhus is a commune in the Seine-Maritime department in the Normandy region in northern France. Étainhus is a farming village in the Pays de Caux, situated some 10 miles northeast of Le Havre, at the junction of the D234 and D39 roads.