EtymologyMac Giolla Ruaidh is an Irish surname meaning "son of the red-haired servant," from mac "son" + giolla "servant" + ruadh "red-haired." It originated in Ireland as a patronymic, denoting lineage from a red-haired servant/devotee (often with religious connotation referring to a monastic servant). The feminine form is Nic Giolla Ruaidh.Notable BearersThe name is historically borne by families in County Monaghan and County Tyrone. The anglicised forms Gilroy, Kilroy, and McElroy became widespread. The Gilroy family's prominence was noted in Irish pedigree records (e.g., Keat's History of Ireland).Cultural SignificanceMac Giolla Ruaidh reflects the Irish tradition of naming based on servantry terms via gilla- compounds, often linked to monastics. Its variants, especially Gilroy (via semi-anglicisation *Gilla Ruad interpreted as 'servant of the ruddy one'*), maintain Irish heritage in diaspora. The stylised form *Mac Giolla Rúis for Ruadh sometimes employs lenition.Meaning: “son of the red-haired servant”Origin: IrishType: SurnameUsage regions: Ireland