Off the top of my head, there was no "distinct" 2 handed sword that the Iron Age celts used, the same way that there was a claymore or Zweihander in the Medieval period. I no zip about the eastern Celts so I could be wrong.
BUT, it was entirely possible to use a "typical" Celtic longsword two handed if the user so wished, and they might have been more effective if used as such.
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