Nomenclature
Most of Ukraine's oblasts are named after their capital cities, officially referred to as "oblast centers" (Ukrainian: обласний центр, translit. oblasnyi tsentr). The name of each oblast is a relative adjective, formed by adding a feminine suffix to the name of respective center city: Khmelnytskyi is the center of the Khmelnyts’ka oblast’ (Khmelnytskyi Oblast).
See also: Romanization of UkrainianRead more about this topic: Khmelnytskyi Oblast