Where's the emphasis, is it RAN-ulf or ran-ULF?
Here's the meaning - (Ranulf is a cognate of Randolph)
From the Germanic elements rand meaning "rim (of a shield)" and wulf meaning "wolf". The Normans brought this name to England, where there existed already an Old Norse cognate Randúlfr, which had been introduced by Scandinavian settlers. Randolf became rare after the Middle Ages, though it was revived in the 18th century (usually in the spelling Randolph).
Shield-Wolf? It's pretty manly, I like it!