Rodulf, or "Hrodulfr," is a known Norwegian name.  "Rod-," or "Hrod," is the same as the "modern Norwegian" "ros" (i.e., praise), and means probably here renowned. (In Northern Mists, Nansen, 1911)

"Hrodulfr (or Hrolfr) setti stein nordr á Gaudi eftir Gudmund, brodursun sinn; druknadi hann thar Oværfadi." Rodolf (or Rolf) raised this stone, north on Gauth, after Gudamund, the son of his brother.  He was drowned there.  Ovair carved (the inscription). (Archaeologia Cambrensis, v.7, 1860)