Cognomen Muthui (Muthui 
) , across the world, is a common family name. The family name Muthui is habitual in Kenya, where it is quite a common surname, United Arab Emirates, where it is a rare surname, and the United States, where it is an extremely rare surname. Very seldom, Muthui is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Muthui | Kenya, United Arab Emirates, United States, India, United Kingdom |
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muthui kariuki Kenyan journalist, ZA (b. 1956) |
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| jonah muthui researcher (ORCID 0000-0003-2750-6020) |
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| michelle k muthui researcher (ORCID 0000-0003-0770-4468) |
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| lucy wangui muthui researcher |
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| mercy muthui researcher |
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| samuel muthui Kenyan businessman (b. 1987) |
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| michelle muthui |
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Mr, Jean, Jeff, Eric, Evan, Fred, Omar, Moses, Mercy, Milka, Mueni, Samba, Sammy, Simon, Susan, Steve, Alice, Alvin, Allan, Agnes, Chris, Caleb, Joan, Clare, John, Jane, Ms, Sam, Ann, Ken, Ryu, Dan, Joe, Job, Tim, Mary, Mark, Mike, Mugo, Alex, Anne, Amos, Beth, Paul, Rose, Ruth, Lucy, Jack, and Cyrus