Where does “Нижне-Вартовский” come from?

Нижне-Вартовский (Russian) comes from Russian ни́жний, from Russian низ, from Proto-Slavic nizъ, from Proto-Indo-European nei-ǵʰ-.

Ancestry of “Нижне-Вартовский”, step by step

StepLanguageWordMeaning
1Russianни́жнийlower
2Russianнизbottom, lower part
3Proto-Slavicnizъdown, below; through, along
4Proto-Indo-Europeannei-ǵʰ-—
Every word from Proto-Indo-European nei-ǵʰ- →Every word from Proto-Slavic nizъ →Every word from Russian низ →