From Proto-Germanic*strēlaz, *strēlō(“arrow, ray, beam”), from Proto-Indo-European*strēl-*strēlā-(“arrow, beam”). Cognate with Old Saxon strāla, Middle Dutch strael (Dutch straal), Old High German strāla (German Strahl). The Indo-European root was also the source of Old Slavic strěla (Russian стрела(strela)).