Prohibited words in character creation

I've seen people discussing this before, but I thought I'd bring it up again, since it's been about a year.
In character creation, when typing a nickname, there seems to be a couple of words being prohibited for use, even non-threatening ones. Examples are "frost", "rage" and "falcon".
I don't find these words as being offensive or rude at all.
Is there a reason why these words are prohibited? Can it be fixed in a future update?