Ó Cléirigh
| O'Cleary Ó Cléirigh | |
|---|---|
| Parent house | Uí Fiachrach Aidhne |
| Country | Kingdom of Connacht |
| Founder | Cleireach mac Ceadach |
| Final ruler | Mhic Mac Comhaltan Ua Cleirigh |
| Titles |
|
| Cadet branches | Coulton Kilkelly Hynes |
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O'Cleary or O'Clery (Irish: Ó Cléirigh) is the surname of a Gaelic Irish family. It is one of the oldest recorded surnames in Europe It is related to Cleary (surname) and often Anglicized as Clark.