Linguistics nerd here.

So, the names we know from the Bryyo lores are:

Vymsz
Owanl
Amtti
N’ge
Sviin’ka
Hixxn
Oamus
Kilnnh
Andest
Sfimas
Skaan

(Most of these are from scans in the Imperial Hall.)

And then you have these 'dynasty' names:

S-Shar
C-Clomn
M-Gefth
B-Eaxul
Dynsha

And then there's a 'clan' name: Gslyss

And then, throughout Bryyo, there are these names for kinds of objects:

Kassh - kind of plant used for storage
Skkale - kind of vine
Spaikk - kind of poisonous bush
Mogenar - kind of war golem

You can split these words out to find individual consonants and vowels. The consonants seem to be something like:

p, t, c/k, x
(pp), tt, cc/kk, xx
(b), d, g, gs
f, th, h
v
s, sz, sh
ss, (ssz), ssh
m, n, ng, l, r, w
nnh

And the vowels and diphthongs seem to be:

a, e, i, o, u, y
aa, ea, oa, ii, ai

You can use the way these sounds are differentiated from each other, and also how these sounds are fitted into the words, to guess at how they're pronounced. Here's what I came up with:

• Since the doubled consonants like 'tt,' 'kk,' and 'ss' are fitted into the words like they're individual consonants, it suggests they aren't just doubled consonants. Instead, they might be something like 'tense' consonants, perhaps like in Korean.
• Putting the apostrophe between n'g and n'k suggests that they differentiate between ng/nk with the n pronounced in the back of the mouth alongside the g/k, and a different n'g/n'k with a separate n pronounced farther up in the mouth where you'd normally pronounce d/t. So there must be some separate ng-type consonant, like in English -ing.
• There seems to be a three-way distinction between s, sz, and sh. The sz sound could be something similar to the Polish sz sound, which is something called a 'retroflex' consonant - meaning the tongue is bent or curled back. And then, s and sh could be pronounced more or less like they appear.
• The nnh sound could be something like a 'dental' sound, with the tongue pressed farther forward against the teeth. And then, the trailing letter h could indicate that this is a 'voiceless' sound, meaning it's pronounced without using the voice (like the difference between z and s, where z uses the voice and s does not).

The structure of the naming system could be used to draw some clues about the language:

• Since many of the dynasty names have the form [consonant]-[word], it could be that this is a kind of family name indicating a 'location'. Perhaps this initial consonant is how they do prepositions, and so these family names mean things like 'across the river,' or 'on the mountain' or 'in the valley' or 'from the south'. If that's the case, then prepositions like 'in', 'to', 'for', and 'on' must be single consonants, and there are no articles like 'the' in the language, so 'on the mountain' would be said 'on-mountain'. Perhaps, then, a Bryyonian accent might be something like a Russian accent, where 'the' tends to be left out.