Where does “Pow Belg” come from?

Pow Belg (Cornish) comes from Proto-Celtic belg-, from Proto-Indo-European bʰelgʰ- — to bulge, swell.

Ancestry of “Pow Belg”, step by step

Pow Belg traces back through two separate lines of ancestry.

via Proto-Celtic belg-

StepLanguageWordMeaning
1Proto-Celticbelg-to swell
2Proto-Indo-Europeanbʰelgʰ-to bulge, swell

via Cornish pow

StepLanguageWordMeaning
1Cornishpowcountry, land; province, region
Every word from Proto-Indo-European bʰelgʰ- →Every word from Proto-Celtic belg- →