In the world, O'Shaughnessy (O'Shaughnessy 
) is a very rare male forename. The given name O'Shaughnessy is habitual in Eastern Asia, particularly China, where it is an extremely rare male name. Much more frequently, O'Shaughnessy is the last name as well as the forename.
| VARIANT | COUNTRY |
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| O'Shaughnessy | United Kingdom, United States, Ireland, Australia, Canada |
O'Seachnasaigh, Oshaughnessey, Oshaughnessy, and Shaughnessy
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tam elizabeth o'shaughnessy American educator, children's science writer, professional tennis player, US (b. 1952) |
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| sir dermot o'shaughnessy Peerage person ID=269068 |
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| gyles o'shaughnessy Peerage person ID=341691 |
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| sir roger o'shaughnessy Peerage person ID=483105 |
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| unknown o'shaughnessy Peerage person ID=483141 |
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| sir roger o'shaughnessy Irish Chief of the Name |
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| sir dermot o'shaughnessy Peerage person ID=37255 |
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| sir dermot o'shaughnessy Peerage person ID=361687 |
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| colman o'shaughnessy Irish bishop |
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| sir roger o'shaughnessy Peerage person ID=116569 |
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| branagh r o'shaughnessy researcher |
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| dudley o'shaughnessy British model and actor, GB (b. 1989) |
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