Where does “trydanwyr” come from?

trydanwyr (Welsh) comes from Welsh trydan, from Welsh tân, from Middle Welsh tan, from Proto-Brythonic tan, from Proto-Celtic teɸnets, from Proto-Indo-European tep- — to be warm, be hot.

Ancestry of “trydanwyr”, step by step

trydanwyr traces back through two separate lines of ancestry.

via Welsh trydan

StepLanguageWordMeaning
1Welshtrydanelectricity; electric fluid
2Welshtânfire
3Middle Welshtan—
4Proto-Brythonictanunder; fire
5Proto-Celticteɸnetsfire
6Proto-Indo-Europeantep-to be warm, be hot

via Welsh ŵyr

StepLanguageWordMeaning
1WelshŵyrSoft mutation of gŵyr; grandson, grandchild
2Middle WelshwyrSoft mutation of gwyr
Every word from Proto-Indo-European tep- →Every word from Proto-Celtic teɸnets →Every word from Proto-Brythonic tan →
trydanwyr — Etymology, Origin & Word History | Etymology Explorer