Family name Kwambai (Kwambai 
) , in all the world, is quite a rare cognomen. The last name Kwambai is characteristic of Kenya, where it is quite a rare surname, Australia, where it is a very rare surname, and Nigeria, where it is an extremely rare surname. Not in comparison with a country's population, it most frequently occurs in Kenya, Nigeria, and the United States. Very seldom, Kwambai is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kwambai | Kenya, United States, Nigeria, Australia |
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irene kwambai Kenyan distance runner, KE (b. 1978) |
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james kipsang kwambai Kenyan road running athlete, KE (b. 1983) |
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robert kwambai Kenyan athletics competitor, KE (b. 1985) |
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| caroline kwambai Kenyan athletics competitor, KE (b. 1975) |
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| titus kwambai researcher |
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Amos, Daniel, George, Joshua, Justin, Nelson, Victor, Isaack, Ronald, Michael, Gilbert, Hillary, Caroline, Beatrice, Kiplagat, Emmanuel, Wilkister, Kennedy, Millicent, Robert, Aglyne, Ruth, Dawn, Joan, Mercy, Beryl, Brian, Karin, Philip, Peter, Titus, Elias, Edwin, Evans, Haron, Faith, Usman, James, and Kiprotich