Type Word Usage Old Celtic (Hypothetical) Meaning & History Celtic word meaning "peace" or "fairy mound, tumulus" [1]. Related ItemsDetails Other Languages & Culturessíd(Old Irish) hedd(Old Welsh) Given Name DescendantSítheach(Medieval Irish) Surname DescendantsMac Síthigh, McSheehy, Sheehy(Irish) Sources & References Matasović, Ranko. Etymological Dictionary of Proto-Celtic. Brill, 2009, page 326.
