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Hildr is a monothematic name derived from Old Norse hildr ‘battle’, and in Old Norse mythology it was the name of a valkyrie
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Hildr is attested in the Prose Edda as Högni's daughter and Hedin's wife in the Hjaðningavíg. She had the power to revive the dead in battlefields and used it to maintain the everlasting battle between Hedin and Högni (source: Wikipedia)