Viera lore is pretty sparse, but here's how Square describes it: Traditional Viera forenames given at birth are also referred to as “forest names,” as they are used by those Viera still residing in their homeland ...
In practice, however, one will rarely encounter a Viera using her forest name, as those who choose to leave their homes and strike out into the wider world will generally choose new “city names” for themselves to mark their parting from the traditional Viera way of life.
Her name changing to Ash is more a mark of her becoming someone vastly different than who she was before and an alienation from her previous self.
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Viera lore is pretty sparse, but here's how Square describes it:
Traditional Viera forenames given at birth are also referred to as “forest names,” as they are used by those Viera still residing in their homeland ...
In practice, however, one will rarely encounter a Viera using her forest name, as those who choose to leave their homes and strike out into the wider world will generally choose new “city names” for themselves to mark their parting from the traditional Viera way of life.
Her name changing to Ash is more a mark of her becoming someone vastly different than who she was before and an alienation from her previous self.