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Last name origins & meanings:

1. English: from the Middle English personal name Rolf, composed of the Germanic elements hrōd ‘renown’ + wulf ‘wolf’. This name was especially popular among Nordic peoples in the contracted form Hrólfr, and seems to have reached England by two separate channels; partly through its use among pre-Conquest Scandinavian settlers, partly through its popularity among the Normans, who, however, generally used the form Rou(l) (see Rollo).
2. North German: from a personal name, a contracted form of Rudolf, cognate with 1.