Flainn

Flainn is a surname. Notable people with the surname include:
 * Aenghus Ua Flainn
 * Ailill Corrach mac Flainn (died 741), king of the Uí Failge, a Laigin people of County Offaly
 * Cináed mac Flainn (died 770), king of the Uí Failge, a Laigin people of County Offaly
 * Conaing mac Flainn (died 849), King of Brega from the Uí Chonaing sept of Cnogba (Knowth) of the Síl nÁedo Sláine branch of the southern Ui Neill
 * Cummascach mac Flainn (died 757), king of the Uí Failge, a Laigin people of County Offaly
 * Donnchad Donn mac Flainn
 * Fithceallach mac Flainn
 * Flaithnia mac Flainn (died 755), king of the Uí Failge, a Laigin people of County Offaly
 * Flann Mac Flainn
 * Mugrón mac Flainn (died 782), king of the Uí Failge, a Laigin people of County Offaly
 * Nicol Mac Flainn
 * Ragnall Ua Flainn Chua
 * Tóim Snáma mac Flainn (died 770), King of Osraige in modern County Kilkenny
 * Ólchobar mac Flainn (died 796), supposed King of Munster from the Uí Fidgenti of County Limerick