... Domesday has Raginwald in various forms, as Ragenald, Reynald, and Rainald, the latter fourteen times after the Conquest; and amongst them all we have derived our Christian name of Reginald, and the surname of Reynolds. 
    Ragn, or judgment, the leading word in this class of names, is connected with the Latin rego, to rule, and as rectus sprang from the one, so the Gothic raihts and our right arose from the Teutonic forms, as well as to wreak, and the German rache, vengeance, both from the old idea of justice.  Ragn, though primarily meaning justice, is also used, as judgment is, in the sense of wisdom... (History of Christian Names, Yonge, 1884).