Cognomen Karanja (Karanja 
) , in all the world, is a widespread surname. The family name Karanja is habitual in Kenya, where it is a common surname, Qatar, where it is quite a rare surname, and United Arab Emirates. In absolute terms, this name is the most popular in Kenya, the United States, and Uganda. Much less frequently, Karanja is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Karanja | Kenya, Uganda, Tanzania, United States, United Arab Emirates |
| frangs karanja Kenyan Paralympian, KE (b. 1901) |
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francis thuo karanja Kenyan paralympic athlete, KE (b. 1975) |
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| josephat karanja Kenyan politician, KE (b. 1931) |
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| tabitha karanja Kenyan businesswoman, entrepreneur and industrialist., KE (b. 1964) |
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| joseph kinyanjui karanja (b. 1962) |
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| k. k. karanja American chess player, US (b. 1973) |
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| edward karanja Kenyan footballer (b. 1974) |
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| susan karanja Kenyan neurosurgeon, KE |
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| henry k karanja researcher |
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| sarah karanja researcher |
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| lucy nyambura karanja researcher |
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| diana m s karanja researcher |
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| anne karanja Kenyan businesswoman, auditor and corporate executive, KE |
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| henry karanja researcher |
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| simon karanja researcher |
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