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I am pretty sure that this name was made up for the film, a search

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"runeard" -frozen -arendell site:wikipedia.org

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reveals essentially nothing, so no notable Runeards can be found outside the film.

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For a meaning, you can retrofit some Germanic name elements, the first part is clearly "rune", the second one can also be "hard" instead of earth (which is not a frequent deuterotheme in Germanic names, and is of feminine grammatical gender in German, thus unfitting for a male).

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--elbowin