Cognomen Olweny (Olweny 
) , worldwide, is quite a rare last name. The family name Olweny is habitual in Sub-Saharan Africa, particularly Uganda, where it is quite a rare surname, Kenya, and Tanzania, where it is a very rare surname. Measured by absolute frequency, it most frequently occurs in Kenya, Uganda, and the United States. Much less frequently, Olweny is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Olweny | Kenya, Uganda, United States, Tanzania, South Sudan |
| charles olweny Vice-Chancellor at Uganda Martyrs University, UG (b. 1944) |
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| sunday olweny Ugandan sprinter, UG (b. 1967) |
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| catherine n olweny researcher (ORCID 0000-0003-3537-1795) |
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| patrick ayiecho olweny Kenyan politician, KE |
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| mark olweny researcher (ORCID 0000-0002-1630-5584) |
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