Cognomen Mwai (Mwai 
, مواي) , throughout the world, is a common last name. The surname Mwai is characteristic of Sub-Saharan Africa, particularly Kenya, where it is quite a common surname, Botswana, where it is quite a rare surname, and Mauritius. In absolute terms, this name is the most popular in Sub-Saharan Africa, particularly Kenya, Tanzania, and South Sudan. Much less frequently, Mwai is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Mwai | Kenya, Malawi, Tanzania, South Sudan, Myanmar |
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mwai kibaki 3rd President of Kenya, KE (b. 1931) |
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| jane mwai volleyball player (b. 1970) |
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| judy mwai researcher |
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| leah mwai researcher |
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| mwai kamuyambeni Malawian politician, MW |
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| mwai banda |
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Mr, Cate, Beth, Kate, Kris, Pann, Paul, Pius, Rose, Ruth, Dave, Leah, Lily, Lucy, Jane, Jack, Jose, John, Joan, Joel, Jeff, June, Amos, Judy, Anne, Stan, Ms, Jo, Sam, Ann, Ben, Bob, Ken, Kui, Kim, Dan, Joe, Joy, Eva, Ivy, Ida, Ian, Mary, Mark, Mama, Mike, Mugo, Alex, and Thor