köken: From Middle Welsh blew; cognate with Breton blev and Cornish blew. Of uncertain ultimate origin and lacking Celtic cognates outside of Brythonic. Perhaps related to Ancient Greek φλόος (phlóos, “rind, bark”). Or, related to Lithuanian plùskos (“hair”) and Proto-West Germanic *fleus (“fleece”), from Proto-Indo-European *plews- (“to pull out, pluck”).
aile: achub y blewyn a cholli’r bwrn, amranflew, at y blewyn, blew amrant, blew cae, blew glas, blew llygaid, blew Medi, blew pen, blew pigog
köken: An early loanword from a South Slavic language, from Proto-Slavic *rędъ (“row, line”) with a preserved nasal. Compare Old Church Slavonic рѧдъ (rędŭ, “line, order”), Serbo-Croatian red (“row”), Bulgarian ред (red, “row”), and West Slavic descendant Polish rząd (“row”).
Unknown origin; possibly of Gaulish origin (compare Catalan bri, Spanish brenca (“fiber”), brinza (“blade of grass, filament”)), from Proto-Celtic *brinikā, from *brinos (“filament, fiber”) (compare Breton broenenn, Welsh brwynen), from Proto-Indo-European *bʰrugh-no- (“twig”), perhaps related to the root of English brush.