The story
- Irish · derived fromÓ Muimhneacháin“descendant of Muimhneachán”
- English todayMoynihan
Anglicized form of Irish Ó Muimhneacháin (“descendant of Muimhneachán”), a diminutive of Muimhneach (“Munsterman”).
Etymology from Wiktionary, CC BY-SA 4.0.