Oise

Oise (a department of Picardy, Hauts-de-France, France); Oise (a right tributary of the Seine, originating in Belgium and flowing through the departments of Aisne, Oise, Val-d'Oise and Yvelines in northeastern France)

Named after the River Oise, itself from or related to the Roman river name Latin Isara, thus also related to the river Isère.