[an unfinished sandbox]
Actual Untranslated Thyatian is seen in the weekday and month names of the Thyatian Calendar.
"Analysing the Languages of Mystara"
"Words from the Alphatian Calendar"
Thyatian is fictively translated by the TSR employees into English (or other Language of Translation)
In the Classic Reality of Mystara, there are more languages, such as Darokinian and Glantrian. In the Second Edition Reality of Mystara, these are dialects of a single Thyatian Common language.
Language flavors of Thyatian (in the Second Edition Reality):
Thyatian (Darokinian) = Actual Thyatian + Actual Anglo-Celtic flavor words, but with the Actual Thyatian represented as English, resulting in English+Anglo-Celtic flavor words
Planet names in the Mystara solar system:
From the Thyatian weekday names, since in Latin, the weekday names are the same word-roots as the seven planets of traditional astronomy.
Sola (M-Sun)
Tserstara (M-Mercury)
Nytstara (M-Venus)
Mystara (M-Earth)
Gromstara (M-Mars)
Molstara (M-Jupiter)
Loshstara (M-Saturn)