O'Hannegan is an Irish surname, a variant of O'Hannagain. The original Gaelic form is Ó hAnnagáin, meaning "descendant of Annagán". The personal name Annagán is a diminutive of Annadh, which signifies "delay" in Irish.Etymology and OriginThe surname O'Hannagain is derived from the Gaelic Ó hAnnagáin, which belonged to a sept located in County Waterford and County Cork. The root name Annadh is a relatively rare given name, and its diminutive Annagán suggests an endearing or small form, possibly referring to a person characterized by deliberation or patience.VariantsThe anglicization of Irish surnames has led to numerous spelling variants, reflecting phonetic differences and regional pronunciations. Variants of O'Hannegan include: Hanegan, Hanigan, Hannigan, Hannigen, O'Hanegan, and O'Hanigan. The prefix "O'" indicates grand descent or "grandson of," and its omission was common during periods of Anglicization.Distribution and Cultural SignificanceAccording to diaspora data, surnames bearing the root O'Hannagain and its variants are still most common in Ireland, with a concentration in southern counties such as Waterford and Cork. Migration during the Great Famine and subsequent emigration patterns brought the name to English-speaking countries, especially the United States and Canada.Meaning: descendant of AnnagánOrigin: Irish GaelicType: patronymicUsage regions: Ireland, United States, Canada, United Kingdom