You say "stop" like it's a recurring thing that they invent races like this, when it's entirely Viera-specific. And it is part of their culture to often change names when they change status.
Also, any "giving up of culture" happened prior to the beginning of the game – voluntary or forced is up to your imagination, but it wasn't because they were called to be the WoL but upon setting out to be a nameless adventurer doing odd jobs.