Where does “chwefrawr” come from?
chwefrawr (Middle Welsh) comes from Proto-Brythonic *hwevrọr, from Latin Februārius, from Latin Fēbrua, from Latin febris, from Proto-Italic *feɣʷris, from Proto-Indo-European dʰegʷʰris, from Proto-Indo-European dʰegʷʰ- — to burn; warm, hot.
Ancestry of “chwefrawr”, step by step