I always try too pronounce names kind of latin way, except when it's obvious it's should be different...
Jelkala - YEhLkahlah. Gelkahlah sounds odd for me.
Ymira - I(like in english "it")MEErah, same with Yruma(Iruhmah)
Tshibtin - TCH(like in 'Czech')EEb'(almost soundless, or going into v)-teen
Bariyye - BahrEEYeh
Durquba - doorKOObah
but I always say Praven like in English(that A sound). Prahven sounds worse
And I have no idea how to pronounce Uxkhal... OOKSahl? OOKHahl? OOSHkahl?
Even more fun is while playing Brytenwalda... it's just crazy, all that celtic, briton and other languagues...
btw things get really funny when you start to pronounce names like in French
Praven - pRRRahva~~(that aaooooon sound