Where does “llongwyr” come from?

llongwyr (Welsh) comes from Welsh llong, from Welsh llog, from Proto-Brythonic *llong, from Proto-Celtic *longā — boat, vessel.

Ancestry of “llongwyr”, step by step

StepLanguageWordMeaning
1Welshllongship, vessel
2Welshlloginterest, profit, benefit; consecrated place,...
3Proto-Brythonic*llong—
4Proto-Celtic*longāboat, vessel
Every word from Proto-Celtic *longā →Every word from Proto-Brythonic *llong →Every word from Welsh llog →