The answers (as far as I know)
Celebrian passed into the West after being attacked by orcs. Miriel died after having Feanor - so they didn't share the same fate.
Celeborn didn't name Galadriel. I would presume Galadriel's parents Finwe and Earwen did - she was named because of her golden hair.
Amroth was not Galadriel's son.
As for what happened in Valinor, I don't think it was ever mentioned.
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'It must often be so, Sam, when things are in danger: someone has to give them up, lose them, so that others may keep them' ~Frodo
"Life is hard. After all, it kills you." - Katharine Hepburn
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