Where does “Рубіжне” come from?

Рубіжне (Ukrainian) comes from Ukrainian рубі́ж, from Proto-Slavic rǫbežь, from Proto-Slavic rǫbiti, from Proto-Balto-Slavic ramˀb-.

Ancestry of “Рубіжне”, step by step

StepLanguageWordMeaning
1Ukrainianрубі́жfrontier
2Proto-Slavicrǫbežьborder
3Proto-Slavicrǫbitito chop; to hem
4Proto-Balto-Slavicramˀb-—
Every word from Proto-Balto-Slavic ramˀb- →Every word from Proto-Slavic rǫbiti →Every word from Proto-Slavic rǫbežь →