EtymologyCeallach is an Irish male given name derived from the Old Irish Cellach, a name of uncertain origin. Traditional interpretations suggest it may mean "bright-headed," while other theories connect it to the Old Irish cellach meaning "war, strife" or cell meaning "church." The name has been borne by several early Irish kings and by a 12th-century saint who served as Archbishop of Armagh.The name Ceallach is the root of many modern surnames, including Kelly and Kelley, and the Irish patronymic Ó Ceallaigh.Notable BearersSaint Ceallach (also known as Cellach of Armagh) was a 12th-century Irish saint and Archbishop of Armagh. Several early Irish kings bore the name, including Ceallach mac Comgaill and Ceallach mac Feargha.DistributionWhile Ceallach itself remains primarily historical in usage, its anglicized forms such as Kelly have become widespread internationally, particularly in English-speaking countries as both a given name and surname.Meaning: Uncertain, possibly "bright-headed", "war, strife", or related to "church"Origin: Old Irish CellachType: Given name, primarily masculineUsage: Irish, historical and saintly contexts