What is "neuri"

According to Herodotus the Neuri were a tribe living beyond the Scythian, one of the nations along the course of the river Ὕπανις Hypanis ( Southern Bug River), West of the Βορυσθένης Borysthenes ( Dniepr river), roughly the area of modern northern (initially north western) Ukraine (historic Volyn) and southern Belarus.