Etymology

From Old French guerreier ‎(“fighter, combattant”), from Late Latin *werra, *guerra ‎(“war”) (compare dgèrre), from Frankish *werra ‎(“riot, disturbance, quarrel”) from Proto-Germanic *werrō ‎(“confusion, disarray”), from Proto-Indo-European *wers- ‎(“to mix up, confuse, beat, thresh”).