At least, historically the name 'Rollo' derived from Old Norse Hrólfr, which in turn derived from elements meaning 'fame' and 'wolf'. Tolkien's selection of this name was perhaps influenced by a famous historical Rollo, the first Duke of Normandy and a direct ancestor of William the Conqueror. This seems all the more likely since this Duke Rollo was chronicled by a historian named 'Dudo', another name used by Tolkien for one of his Hobbits (albeit as a member of the Baggins family rather than the Boffins).
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