Bozjan lore is properly scuffed.

[Ashlyn_Ishina]

Really it's Hrothgar lore that is a mess. We were told (as a way of excusing the lack of female character models) that women are rare and venerated as "queens" – even Hrothgars' clan concepts revolve around the idea of those bound to a queen and those "lost" without one – and yet every second one we meet seems to be mourning a lost wife and there doesn't seem to have been an effort to integrate it into Bozja at all.

It's possible that the Bozja story was written in an early time when they thought they'd have male and female Hrothgar and not the split with Viera, most noticeably since Misija has an entirely Hrothgar name but we see other minor Roegadyn characters using their standard naming conventions.

For the Misija part, it's because she's Bozjan. The Hrothgar we meet are all Bozjans and Bozja itself uses Slavic naming conventions. For example, Misija literally means Mission. It's the same thing that you can see with Domans and Hinganashi Hyur using Raen names.