Where does “gwyddonwyr” come from?

gwyddonwyr (Welsh) comes from Welsh ŵyr, from Middle Welsh wyr — Soft mutation of gwyr.

Ancestry of “gwyddonwyr”, step by step

gwyddonwyr traces back through two separate lines of ancestry.

via Welsh ŵyr

StepLanguageWordMeaning
1WelshŵyrSoft mutation of gŵyr; grandson, grandchild
2Middle WelshwyrSoft mutation of gwyr

via Welsh gwyddon

StepLanguageWordMeaning
1Welshgwyddonwizard; scientist; hag
Every word from Middle Welsh wyr →Every word from Welsh ŵyr →