Clohessy is a surname. The name itself is an anglicized form of the Gaelic "Ó Clochasaigh," derived from the Gaelic word "cloch" meaning "stone."
Notable people with the surname include:
- David Clohessy, once-Roman Catholic American activist
- Paddy Clohessy (1908–1971), Irish sportsperson and Fianna Fáil politician
- Peadar Clohessy (1934–2014), Irish Fianna Fáil and Progressive Democrats politician
- Peter Clohessy (born 1966), former Irish rugby union footballer
- Robert Clohessy (born 1958), American actor, played Sean Murphy on the HBO drama Oz
- Seán Clohessy (born 1931), retired Irish sportsperson
- Sean Clohessy (born 1986), English professional footballer for Conference side Salisbury City
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