proper noun/ʁwɑ̃/
Rouen (the prefecture of the department of Seine-Maritime, and the capital of the region of Normandy, France, on the Seine River)
Inherited from Old French Roem, from the Roman name, Latin Rotomagus, from the Gaulish name Ratumacos, from *rato- (of unclear origin - see Rouen) + *magos, from Proto-Celtic *magos (“field”).