Where does “toi-” come from?

toi- (Finnish) comes from Welsh to, from Proto-Brythonic toɣ, from Proto-Finno-Ugric towke.

Ancestry of “toi-”, step by step

StepLanguageWordMeaning
1Welshtoroof
2Proto-Brythonictoɣroof, ceiling
3Proto-Finno-Ugrictowke—

Words derived from “toi-”

Every word from Proto-Finno-Ugric towke →Every word from Proto-Brythonic toɣ →Every word from Welsh to →
toi- — Etymology, Origin & Word History | Etymology Explorer