In "Of Maeglin" in HoMe XI, p.318, we learn that the archaic form was "Aegthelion". The root is STEL-, "remain firm", which gives "estel" (the prefixed form), "hope" and S. "thel", "intend, mean, purpose, resolve, will", Q. "thelma", "a fixed idea, will". It's hard to tell (for me at least) whether "Aegthelion" is from the prefixed or unprefixed form. I wonder also whether "-ion" is to be taken as "son" or just a masculine suffix. It might mean "Son of hope" or "Son of fixed resolve".
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