Where does “Tarnovski” come from?

Tarnovski (Portuguese) comes from Bulgarian Търновски, from Bulgarian -ски, from Old Church Slavonic -ьскъ, from Proto-Slavic -ьskъ, from Proto-Indo-European -iskos — Characteristic of, typical of, pertaining to.

Ancestry of “Tarnovski”, step by step

StepLanguageWordMeaning
1BulgarianТърновскиVeliko Tărnovo
2Bulgarian-ски-ish, -ian
3Old Church Slavonic-ьскъ-ic, -ish
4Proto-Slavic-ьskъ-ic, -ish
5Proto-Indo-European-iskosCharacteristic of, typical of, pertaining to
Every word from Proto-Indo-European -iskos →Every word from Bulgarian -ски →Every word from Proto-Slavic -ьskъ →