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Unknown, but 'Ara' denotes 'Lord' or 'King'1
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That's from the Encyclopedia of Arda and this
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Aragorn I: (S: "royal-tree")
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is from Robert Foster's Guide to Middle-Earth.
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ar(a)- "High, noble, royal" orn- "tree"
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Both of those are from the index in the back of the Silmarillion.
Therefore, I think I am at least very close to right with my previous answer.