Where does “リウネ” come from?

リウネ (Japanese) comes from Ukrainian Рі́вне, from Ukrainian рі́вний, from Proto-Slavic orvьnъ, from Proto-Slavic -ьnъ — -ish, -ic, -al, -ed; From adjectives.

Ancestry of “リウネ”, step by step

StepLanguageWordMeaning
1UkrainianРі́вне—
2Ukrainianрі́внийflat
3Proto-Slavicorvьnъstraight; even
4Proto-Slavic-ьnъ-ish, -ic, -al, -ed; From adjectives
Every word from Proto-Slavic -ьnъ →Every word from Proto-Slavic orvьnъ →Every word from Ukrainian рі́вний →