Type Word Usage Old Celtic (Hypothetical) Meaning & History Celtic word meaning "good" [1] . Related ItemsFamily Tree ·Details Other Languages & Culturesdag (Old Irish) da (Old Welsh) Sources & ReferencesShow Inline Numbers Hide Inline Numbers Matasović, Ranko. Etymological Dictionary of Proto-Celtic. Brill, 2009, page 86. Share on Facebook Share on Twitter Entry added May 26, 2026