köken: First recorded in 1545. From Middle High German Ruodolf, from Old High German *Ruodolf, *Hruodwolf, from Proto-West Germanic *Hrōþiwulf, from Proto-Germanic *Hrōþiwulfaz. Cognate with German Rudolf and English Rudolph.
From Old Norse Hrólfr, from Hróðólfr (which also yielded Icelandic Hróðólfur), from hróðr (‘proud’) + úlfr, -ólfr (‘wolf’), cognate with Old English Hruodwulf.