Type Word Usage Old Welsh Meaning & History Old Welsh word meaning "king" [1]. Related ItemsFamily Tree·Details Other Languages & Culturesrīxs(Ancient Celtic) rí, rígain(Old Irish) Given Name DescendantsRiderch, Rotri(Old Welsh) Rhodri, Rhydderch, Roderick(Welsh) Surname DescendantRhydderch(Welsh) Same Spellingri 2, ri 3, ri 4, ri 5, ri 6, rí, rì Sources & References Matasović, Ranko. Etymological Dictionary of Proto-Celtic. Brill, 2009, page 311. Entry updated January 21, 2022