Where does “eisteddfodwyr” come from?

eisteddfodwyr (Welsh) comes from Welsh eisteddfod, from Welsh bod, from Middle Welsh bot, from Proto-Brythonic boð, from Proto-Celtic butā, from Proto-Indo-European bʰuH- — to become, grow, appear.

Ancestry of “eisteddfodwyr”, step by step

StepLanguageWordMeaning
1Welsheisteddfodsitting, session; eisteddfod
2Welshbodto be; that... is, that... are, etc
3Middle Welshbotdwelling
4Proto-Brythonicboð—
5Proto-Celticbutāhut, cabin
6Proto-Indo-EuropeanbʰuH-to become, grow, appear
Every word from Proto-Indo-European bʰuH- →Every word from Proto-Celtic butā →Every word from Proto-Brythonic boð →