Ó Seighin is an Irish surname meaning "descendant of Seighin". The personal name Seighin derives from the Old Irish séigene, meaning "small hawk". This patronymic surname follows the classic Irish naming tradition where "Ó" (originally ua) denotes "grandson" or "male descendant".The name Ó Seighin is chiefly associated with County Cork in Munster. Over time, many bearers anglicized the name, resulting in forms such as Shine, which is a common anglicization in southern Ireland. The preservation of the original Gaelic form remains less common but is maintained by some families proud of their heritage.While Ó Seighin is not among the most widespread Irish surnames, it exemplifies the rich onomastic tradition of Ireland, where surnames often reflect ancestors' attributes, occupations, or physical characteristics. The element "seabhac" (hawk) appears in other Irish names, reinforcing the importance of birds of prey in Gaelic naming.Today, variants of the surname are found mainly in Ireland and among the Irish diaspora, particularly in the United States, Canada, and Australia.Meaning: Descendant of Seighin ("small hawk")Origin: Irish (Gaelic)Type: Patronymic surnameUsage: Ireland; also in areas of Irish immigration