IMCGames announced (Steam version) first 2 server names. Both servers located in North America with European server coming very soon.
Tree of Savior Server Names
For some unknown reason IMC Games decide to use town and not goddess names as server names. It's too late to revert but it really bad choose. Why? since drama already on. You can check game forums and reddit to see it.

First 2 NA Server names : Klaipeda and Orsha.
Passion and some other guild decide to play on Klaipeda.
Brazilian community choose Orsha.
Tree of Savior Server brazilian
Will update this post tomorrow if anything change.

Source
Here you can vote for European Server Location - https://forum.treeofsavior.com/t/eu-server-location/155822