Where does “Трипілля” come from?

Трипілля (Ukrainian) comes from Ukrainian три, from Proto-Slavic trьje, from Proto-Balto-Slavic tríjes, from Proto-Indo-European *tréyes.

Ancestry of “Трипілля”, step by step

Трипілля traces back through two separate lines of ancestry.

via Ukrainian три

StepLanguageWordMeaning
1Ukrainianтриthree
2Proto-Slavictrьjethree
3Proto-Balto-Slavictríjesthree
4Proto-Indo-European*tréyes—

via Russian по́ле

StepLanguageWordMeaning
1Russianпо́леfield, ground
2Proto-Slavicpoľefield
3Proto-Indo-Europeanpleh₂-flat
Every word from Proto-Indo-European *tréyes →Every word from Proto-Balto-Slavic tríjes →Every word from Proto-Slavic trьje →