I have both a British and an American edition of the book, and yes it is Maugrim in the original Brit and Fenris in the later American edition.
Paul Ford, a C.S. Lewis scholar, has this to say about Fenris: "No evidence has yet come to light to indicate whether or when Lewis made this change for his American readers. Since he had a predilection for Norse images, he may have thought the name change to be an improvement." He also says that the name Maugrim "means perhaps 'savage jaws', or alludes to maugre, 'ill will' ". And yes, Fenris is "the great wolf of Scandinavian mythology, spawned by Loki (god of strife and spirit of evil), and slain by the fearless Vidar, son of Odin".
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