Where does “Рочму” come from?

Рочму (Komi-Zyrian) comes from Komi-Zyrian му, from Proto-Permic *mu, from Proto-Uralic mëxe, from Proto-Indo-European meǵh₂s — great.

Ancestry of “Рочму”, step by step

Рочму traces back through two separate lines of ancestry.

via Komi-Zyrian му

StepLanguageWordMeaning
1Komi-Zyrianмуearth
2Proto-Permic*muearth, land
3Proto-Uralicmëxeearth, land
4Proto-Indo-Europeanmeǵh₂sgreat

via Komi-Zyrian роч

StepLanguageWordMeaning
1Komi-ZyrianрочThe Russian language
2Proto-Permic*roć—
Every word from Proto-Indo-European meǵh₂s →Every word from Proto-Uralic mëxe →Every word from Proto-Permic *mu →