Family name Mwathi (Mwathi 
) , in the world, is quite a common last name. The cognomen Mwathi is characteristic of Kenya, where it is quite a common surname, United Arab Emirates, where it is a rare surname, and the United Kingdom, where it is a very rare surname. Not in comparison with a country's population, it most frequently occurs in Kenya, the United States, and United Arab Emirates. Very seldom, Mwathi is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Mwathi | United Kingdom, United Arab Emirates, Kenya, Australia, United States |
| cecilia wangechi mwathi Kenyan mathematician, KE (b. 1963) |
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| margaret w mwathi researcher |
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| peter mungai mwathi Kenyan politician, KE |
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Mr, Alice, Allan, Agnes, Kathy, Kevin, Peter, David, Dolly, Grace, Loise, Jacob, James, Joyce, Nancy, Nduta, Njeri, Erick, Helen, Hilda, Fancy, Faith, Sonia, Isaac, Simon, Sammy, Ms, Ann, Roy, Dan, Job, Ian, Mary, Shem, Alex, Anne, Kari, Paul, Ruth, Leah, Jane, John, Judy, Eddy, Eric, Moses, Milly, Shiko, and Irene