Where does “penn” come from?

penn (Middle Breton) comes from Old Breton penn, from Proto-Brythonic penn, from Proto-Celtic kʷennom — head.

Ancestry of “penn”, step by step

StepLanguageWordMeaning
1Old Bretonpenn—
2Proto-Brythonicpennhead
3Proto-Celtickʷennomhead

Words derived from “penn”

Every word from Proto-Celtic kʷennom →Every word from Proto-Brythonic penn →Every word from Old Breton penn →