Where does “tiwoulgou” come from?

tiwoulgou (Old Cornish) comes from Proto-Brythonic tɨβ̃uɨl, from Proto-Celtic temeslos, from Proto-Indo-European tēmH- — dark.

Ancestry of “tiwoulgou”, step by step

StepLanguageWordMeaning
1Proto-Brythonictɨβ̃uɨldarkness
2Proto-Celtictemeslosdarkness
3Proto-Indo-EuropeantēmH-dark

Words derived from “tiwoulgou”

Every word from Proto-Indo-European tēmH- →Every word from Proto-Celtic temeslos →Every word from Proto-Brythonic tɨβ̃uɨl →