Quote Originally Posted by Enkidoh View Post
It makes a kind of sense though for two reasons - Etheirys, as in, the original Ancient world, no longer exists and hasn't existed for 12000 years. It was Sundered into the Source and it's thirteen Shards. Additionally, as a result of the Sundering, everyone's memories were at the very least muddled, if not erased, so the very knowledge of the original name would have quickly disappeared anyway, with successive Calamities all but finishing the job. And as Hydaelyn became "the will of the Star", the planet's consciousness if you will, it makes sense her contact with the planet's inhabitants would result in her name becoming adopted as the world's name.

Really, I found the sudden shift to important npcs using the term 'Etheirys' for the world when they've been calling it 'Hydaelyn' all their lives to be rather jarring, but that was just me. Either way, Yoshi himself basically said "call it what you feel comfortable with, as all the names are really true", and because I'm stubborn, I'm going to keep calling the planet Hydaelyn, except in context of the Ancient world, when Etheirys is appropriate. But that's just me.
Yeah, I think the mistake the OP made was presuming that the rename was intentional. There's no reason for that but ego, and Venat was not so egotistical. The name 'Hydaelyn' just caught on as the name of the planet because people kept awakening to the Echo, hearing the voice of someone named Hydaelyn, and going 'oh, that must be the planet'.

I personally disagree with everyone suddenly calling the planet Etheirys, but it was probably a benefit to clarity that they did for the expansion when both the planet and the god were both major factors. As to an in-universe reason, though... honestly, I'm gonna attribute it to the fact that everyone who does that is from Sharlayan, and Sharlayan as a nation is so nerdy and full of themselves that they'd absolutely lord a new way to be right over people. Basically, all of them are preparing for a chance to pull the 'actually, Frankenstein was the doctor's name' card.