Family name Kinuthia (Kinuthia 
) , all over the world, is a common cognomen. The cognomen Kinuthia is habitual in Kenya, where it is quite a common surname, Qatar, where it is quite a rare surname, and United Arab Emirates. Not in comparison with a country's population, it most frequently occurs in Kenya, the United States, and United Arab Emirates. Very seldom, Kinuthia is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kinuthia | Kenya, United Arab Emirates, Saudi Arabia, United States, Qatar |
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ruth kinuthia Kenyan model/ Make up artist, KE (b. 1986) |
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| ibrahim kinuthia Kenyan distance runner, KE (b. 1963) |
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| fred kinuthia Kenyan boxer, KE (b. 1969) |
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| john kinuthia researcher |
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| j m kinuthia researcher |
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| kinuthia u muthai researcher |
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| eliud kinuthia Kenyan security specialist, KE |
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| peter kinuthia researcher (ORCID 0000-0001-8181-736X) |
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| kinuthia murugu Kenyan politician, KE |
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| kinuthia mbugua politician, KE |
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| wanja kinuthia researcher |
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| mary kinuthia Kenyan footballer (b. 1990) |
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Mr, Amos, Cpak, Beth, Kelx, Paul, Pius, Rose, Rita, Ruth, Leah, Lisa, Lucy, Luis, Jane, John, Joan, Joel, Jean, Jeff, Judy, Tony, Anne, Alex, Musa, Mike, Ms, Sam, Ali, Ann, Ken, Kio, Roy, Dan, Don, Leo, Tito, Lea, Joy, Job, Tom, Tim, Eng, Eve, Ivy, Ian, Mary, Mark, Joe, and Nick