Cognomen Okolo (Okolo 
) , worldwide, is a common last name. The surname Okolo is characteristic of Sub-Saharan Africa, particularly Nigeria, where it is quite a common surname, Niger, where it is quite a rare surname, and the Democratic Republic of the Congo. Not in comparison with a country's population, this name is the most popular in Nigeria, the Democratic Republic of the Congo, and the United States. Likewise, Okolo is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Okolo | Kenya, United States, Niger, Democratic Republic of the Congo, Nigeria |
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courtney okolo American athletics competitor, US (b. 1994) |
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| jude thaddeus okolo Nigerian apostolic nuncio, NG (b. 1956) |
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| bartho okolo Nigerian academic |
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| felicia okolo researcher |
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| amara nicole okolo Nigerian Writer and Lawyer, NG |
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| christopher okolo researcher |
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| patrick noah okolo Ph.D. University of Agriculture, Makurdi 2015 |
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| chidinma a okolo physiologist, researcher |
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| amanda i okolo researcher (ORCID 0000-0002-2328-2085) |
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| onyemaechi n okolo researcher |
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| sophie okolo member or fellow of the New York Academy of Medicine |
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| angela okolo Nigerian physician |
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| james okolo (died 2010) |
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| gregory n okolo researcher ORCID ID = 0000-0001-7216-1426 |
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| peter okolo boxer |
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