Type Word Usage Old Irish Meaning & History Old Irish word meaning "peace" or "fairy mound, tumulus", both from a root meaning "to sit" [1]. Related ItemsFamily Tree·Details Other Languages & Culturessedom(Old Celtic) hedd(Old Welsh) Given Name DescendantsSíomha(Irish) Sítheach(Medieval Irish) Síthmaith(Old Irish) Surname DescendantsMac Síthigh, McSheehy, Sheehy(Irish) Sources & References Matasović, Ranko. Etymological Dictionary of Proto-Celtic. Brill, 2009, page 326.
