Cognomen Wanjohi (Wanjohi 
) , globally, is a common last name. The surname Wanjohi is habitual in Kenya, where it is quite a common surname, Qatar, where it is quite a rare surname, and Burundi. Measured by absolute frequency, it most frequently occurs in Kenya, Uganda, and the United States. Much less frequently, Wanjohi is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Wanjohi | United Arab Emirates, Uganda, United States, Burundi, Kenya |
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isaac macharia wanjohi Kenyan athletics competitor, KE (b. 1980) |
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| milka wanjohi researcher (ORCID 0000-0003-4289-4762) |
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| bernard k wanjohi researcher (ORCID 0000-0002-2790-0338) |
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| george mike wanjohi Kenyan politician |
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| stella wanjohi researcher (ORCID 0000-0002-3371-7740) |
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| waceke wanjohi Professor at Kenyatta University, KE |
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| milka wanjohi |
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