Where does “байкальский” come from?

байкальский (Russian) comes from Russian -ский, from Old East Slavic -ьскъ.

Ancestry of “байкальский”, step by step

StepLanguageWordMeaning
1Russian-скийUsed to form adjectives from nouns or sometimes...
2Old East Slavic-ьскъ—
Every word from Old East Slavic -ьскъ →Every word from Russian -ский →