Cognomen Wanjiru (Wanjiru 
, Ванджиру) , all over the world, is a widespread family name. The last name Wanjiru is characteristic of Kenya, where it is a common surname, Jersey, where it is quite a common surname, and United Arab Emirates, where it is quite a rare surname. In absolute terms, it most frequently occurs in Kenya, United Arab Emirates, and Saudi Arabia. Much less frequently, Wanjiru is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Wanjiru | Saudi Arabia, United Arab Emirates, United States, Uganda, Kenya |
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ruth wanjiru Kenyan long-distance runner, KE (b. 1981) |
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samuel kamau wanjiru Kenyan athlete, KE (b. 1986) |
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evelyn wanjiru Kenyan singer, KE (b. 1989) |
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daniel kinyua wanjiru Kenyan long-distance runner, KE (b. 1992) |
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| florence wanjiru Kenyan athlete, KE (b. 1950) |
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| wanjiru kihoro economist, writer, feminist, a founding member of Akina Mama wa Afrika (b. 1953) |
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| wanjiru kinyanjui Kenyan writer, poet, journalist and filmmaker., KE (b. 1958) |
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| wanjiru mbugua Kenyan Tennis player (b. 1973) |
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| esther wanjiru athletics competitor, KE (b. 1977) |
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| wanjiru kamau-rutenberg Kenyan political scientist (born 1978), KE (b. 1978) |
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| catherine wanjiru Kenyan volleyball player, KE (b. 1978) |
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| grace wanjiru Kenyan racewalker, KE (b. 1979) |
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| sue wanjiru Kenyan actress |
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| wanjiru waruiru researcher (ORCID 0000-0002-8355-8004) |
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| roseline wanjiru researcher |
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