Ó Séaghdha is an Irish surname meaning "descendant of Séaghdha." The root name Séaghdha derives from Old Irish Ségdae, likely from ségda meaning "fine, good, favourable, learned." According to Irish legend, Séaghdha was a boy slated for sacrifice who was saved by his mother.The name has been anglicized as O'Shea and Shea, common variants in the English-speaking world. The prefix "Ó" indicates descent, typical of Irish patronymic surnames. The name is primarily found in Ireland, with concentrations in Munster.Cultural SignificanceThe Ó Séaghdha surname reflects the importance of lineage in Irish naming traditions. The qualities associated with the root—learnedness and goodness—may have made the name appealing to families wanting to claim such attributes in their ancestry.While not widespread globally, those bearing the original Gaelic form are almost all concentrated in Ireland, a marker of identity tied to pre-Anglicization history.Key FactsMeaning: Descendant of SéaghdhaOrigin: IrishType: SurnameUsages: IrishVariants: O'Shea, Shea