Cognomen Okello (Okello 
, Окелло 
) , in all the world, is a common last name. The surname Okello is habitual in Kenya, where it is quite a common surname, Uganda, and Iceland, where it is quite a rare surname. Measured by absolute frequency, it most frequently occurs in Sub-Saharan Africa, particularly Kenya, Uganda, and Tanzania. Much less frequently, Okello is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Okello | Tanzania, Ethiopia, United States, Uganda, Kenya |
| Окелло | Ukraine |
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henry oryem okello Ugandan politician, UG (b. 1960) |
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| tito lutwa okello President of Uganda (1914-1996), UG (b. 1914) |
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francis okello Ugandan general |
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paul okello Founder & C.E.O of Visit Africa, UG |
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| john okello East African revolutionary, leader of the Zanzibar Revolution (1937-1971), UG (b. 1937) |
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| jean baptiste okello Ugandan athlete, UG (b. 1940) |
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| okello oculi Ugandan poet, NG (b. 1942) |
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| sylvanus okello Kenyan boxer, KE (b. 1963) |
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| okello sam Ugandan musician, actor, and comedian, UG (b. 1969) |
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| emmy okello Ugandan consultant physician, UG (b. 1975) |
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| john b a okello researcher |
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| daniel micheal okello researcher |
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| joseph okello professor of philosophy of Christian religion |
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| clement d okello researcher |
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| edward j okello researcher (ORCID 0000-0002-5741-666X) |
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