John Nagl (born 1966), American military officer and author
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Franz Xaver Nagl (1855–1913), Austrian clergy, Cardinal of the Roman Catholic Church and Archbishop of Vienna
However, Sigmund Feist (1909) rejects the theory on etymological grounds, as does Albert Morley Sturtevant (1951) on the grounds of major difficulties, and their points have led Bruce Lincoln (1977) to comment that "there is no reason whatever to contend that nagl- does not have its usual meaning of "nail" and that Naglfar is anything other than the nail-ship, just as Snorri describes it."