Mainly U.S.: medieval vernacular form of Randolf. This was in common use as a given name into the 17th century and gave rise to a surname. In modern use the given name is often a transferred use of this surname.
English: from the Middle English personal name Saher or Seir. This is probably a Norman introduction of the Continental Germanic personal name Sigiheri, composed of the elements sigi ‘victory’ + heri ‘army’. However, it could also represent a Middle English survival of an unrecorded Old English name, Sǣhere, composed of the elements sǣ ‘sea’ + here ‘army’.