Where does “Breten Vyghan” come from?

Breten Vyghan (Cornish) comes from Cornish Breten, from Proto-Brythonic Pritanī, from Proto-Celtic *Kʷritanī, from Proto-Indo-European kʷer- — to do; to make; to build.

Ancestry of “Breten Vyghan”, step by step

Breten Vyghan traces back through two separate lines of ancestry.

via Cornish Breten

StepLanguageWordMeaning
1CornishBreten
2Proto-BrythonicPritanī
3Proto-Celtic*Kʷritanī
4Proto-Indo-Europeankʷer-to do; to make; to build

via Cornish byghan

StepLanguageWordMeaning
1Cornishbyghanlittle
2Proto-Brythonicbɨxsmall
3Proto-Celtic*biggossmall, little
Every word from Proto-Indo-European kʷer-