Galadriel is not Melian. Melian left Middle Earth after Thingol was killed. And she was a Maia so there is definitely a difference between the two.
I dont know about Este. As you said, Estel means hope and was used as part of Aragorns name. It was also used in the name Estelmo, who was the esquire of Elendur ( [img]smilies/smile.gif[/img]). Sorry I couldn't help that much.
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Son of Isildur.
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