The language spoken by the dwellers of Bashkortostan is Bashkir language. There's company named Bashkirian Airlines but also another company named "Bashkir Soda Company". Are the two adjectives interchangeable? That is, could both Bashkir and Bashkirian be used as adjectives meaning of or relating to Bashkiria, or would Bashkir be normally used only in relation to language or a person?
Or is there a distinction between business usage and usage in everyday speech? Are companies' choices of the nationality/language-related adjectives less confined?