Type Word Usage Old Welsh Meaning & History Old Welsh word meaning "ruler, leader" [1] . Related ItemsFamily Tree ·Details Other Languages & Cultureswalos (Old Celtic) fal (Old Irish) Given Name DescendantsToal (Irish) Túathal (Old Irish) Iudgual, Tutgual (Old Welsh) Idwal, Tudwal (Welsh) Surname DescendantsO'Toole, Ó Tuathail, Toole (Irish) Sources & ReferencesShow Inline Numbers Hide Inline Numbers Matasović, Ranko. Etymological Dictionary of Proto-Celtic. Brill, 2009, page 402. Share on Facebook Share on Twitter Entry updated May 26, 2026