Where does “tasow wydn” come from?

tasow wydn (Cornish) comes from Cornish tasow, from Cornish tas, from Proto-Brythonic tad, from Proto-Celtic tatos.

Ancestry of “tasow wydn”, step by step

tasow wydn traces back through two separate lines of ancestry.

via Cornish tasow

StepLanguageWordMeaning
1Cornishtasowplural of tas; fathers
2Cornishtasfather
3Proto-Brythonictadfather
4Proto-Celtictatos—

via Cornish gwydn

StepLanguageWordMeaning
1CornishgwydnAlternative spelling of gwynn; white
Every word from Proto-Celtic tatos →Every word from Proto-Brythonic tad →Every word from Cornish tas →