Cognomen Graddy (Graddy 
) , around the globe, is quite a rare surname. The last name Graddy is habitual in the United States, where it is a rare surname, New Zealand, and Belgium, where it is a very rare surname. Not in comparison with a country's population, it is commonest in the United States, Canada, and New Zealand. Very seldom, Graddy is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Graddy | Canada, New Zealand, Indonesia, United States, Democratic Republic of the Congo |
| kathryn jo graddy economist (b. 1963) |
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| lisa kathleen graddy American historian |
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| elizabeth ann graddy Ph.D. Carnegie Mellon University 1984 |
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| charles m r graddy researcher |
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