The Irish surname Hynes from the Gaelic Ó hEidhin is found predominantly in the western province of Connaught particularly in counties Galway, Mayo and Clare. Eidhean mac Cléireach, the ancestor of the Hynes family of County Galway lived around the year 800. He was a member of the dynasty of Uí Fiachrach Aidhne, 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. The name was introduced to the New World in 1640 when Sarah Hynes arrived in Virginia. Today there are 8,000 bearers of the name Hynes living in the US.
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