On the note of Viis
It's worth noting there are a couple Rak'Tika Viis who seem to defy the -et endings, some of which reside in Fanow itself. The three involved the ritual for the aether current quest come to mind; I can't remember their names offhand though. Maybe the ending of their names has to do with occupation? Ex: names with -et are hunters and the others are related to rituals? Could just be a tribe ending too though.
There's also a few who seem to have totally different conventions all-together: Carna in Eulmore and Bethana in the Crystarium. Lyna too, of course. The names are greek/latin, which stick out a bit. Though maybe the -a suffix are just Viis who left their tribes.