Last name Hannafin (Hannafin 
) , in the entire world, is a rare surname. The last name Hannafin is habitual in Ireland, where it is quite a rare surname, the United Kingdom, where it is a very rare surname, and the United States. Much less frequently, Hannafin is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Hannafin | Canada, United States, United Kingdom, Ireland |
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michael j hannafin American professor, US (b. 1950) |
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| jo hannafin American rower, US (b. 1955) |
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| dermot hannafin Gaelic footballer, IE |
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| bob hannafin college basketball player (1973–1974) St. Francis (NY) |
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| robert hannafin college basketball player (1975–1976) St. Francis (NY) |
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| dermot hannafin Irish Gaelic footballer, IE |
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