Cognomen Ostuni (Ostuni 
) , globally, is quite a rare family name. The last name Ostuni is habitual in Paraguay, where it is quite a rare surname, Italy, and Uruguay. In absolute terms, it is commonest in Italy, Paraguay, and the United States. Much less frequently, Ostuni is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Ostuni | Uruguay, Paraguay, Argentina, Italy, United States |
| omar ostuni UY (b. 1935) |
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| ricardo ostuni AR (b. 1937) |
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| renato ostuni researcher |
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| giustina ostuni Italian scholar of Byzantine goldsmithing, IT |
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| angela ostuni researcher |
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| john ostuni Ph.D. Rutgers University, New Brunswick 1993 |
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| ostuni r researcher |
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| mariano ostuni researcher |
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| pierantonio ostuni researcher |
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| vittoria ostuni minuzzi women's rugby union player from Italy, IT |
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