Cognomen Njenga (Njenga 
) , in the entire world, is a common surname. The cognomen Njenga 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, it is the most numerous in Kenya, Tanzania, and the United States. Very seldom, Njenga is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Njenga | Kenya, Tanzania, Qatar, United States, United Arab Emirates |
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njenga karume politician, KE (b. 1929) |
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daniel njenga Kenyan marathon runner, KE (b. 1976) |
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| john njenga Roman Catholic archbishop, KE (b. 1928) |
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| eva njenga Kenyan physician, KE (b. 1975) |
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| m kariuki njenga researcher, KE |
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| francis kigo njenga Kenyan politician |
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| sammy m njenga researcher |
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| peter njenga |
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