From the Old Norse personal name Rögnvaldr (composed of regin ‘advice, decision’ (also, ‘the gods’) + valdr ‘ruler’). This name was regularly used in the Middle Ages in northern England and Scotland, where Scandinavian influence was strong. It is now widespread throughout the English-speaking world.
French (Eugène): from the personal name Eugène (Latin Eugenius, from Greek Eugenios meaning ‘well-born’, ‘noble’). This was borne by a 3rd-century bishop and martyr, who gave the personal name some currency during the Middle Ages. In some cases it may also represent an Americanized form of a Greek patronymic family name of this origin, for example Eugeniadis or Eugenidis.