Where does “pedn-seythednow” come from?

pedn-seythednow (Cornish) comes from Cornish pedn-seythen, from Cornish penn-, from Cornish penn, from Middle Cornish pen, from Old Cornish pen, from Proto-Brythonic penn, from Proto-Celtic kʷennom — head.

Ancestry of “pedn-seythednow”, step by step

StepLanguageWordMeaning
1Cornishpedn-seythenweekend
2Cornishpenn-head, top
3Cornishpennhead; top; end
4Middle Cornishpen—
5Old Cornishpenhead
6Proto-Brythonicpennhead
7Proto-Celtickʷennomhead
Every word from Proto-Celtic kʷennom →Every word from Proto-Brythonic penn →Every word from Old Cornish pen →