Eidhean mac Cléirigh, ancestor of the Ó hEidhin/Hynes family of County Galway, fl.
Eidhean was a member of the dynasty of Uí Fiachrach Aidhne, and a descendant of Guaire Aidne mac Colmáin (d. 663), Fiachrae mac Eochaid Mugmedon (fl.
5th century) and thus distantly related to the dynasty of Uí Néill.
His descendants ruled Aidhne for a time, most notably in the 1090s when Flaithbertaigh Ua Flaithbertaigh seized the kingship of Connacht and installed an Ó hEidhin as a puppet-king for a time.
He was killed in battle against Neide mac Onchu, about the year 800.