Cognomen Thumbi (Thumbi 
) , worldwide, is quite a common last name. The cognomen Thumbi is habitual in Kenya, where it is quite a common surname, the United States, where it is an extremely rare surname, and India. Much less frequently, Thumbi is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thumbi | United Kingdom, United States, South Africa, Kenya, India |
| thumbi ndung'u Kenyan virologist, KE (b. 1969) |
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| thumbi mwangi researcher, KE |
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Mr, Joyce, Titus, Edwin, Henry, Faith, Irene, Martin, Malkia, Samuel, James, Andrew, Akhila, Benson, Kellen, Kimani, Pharis, Robert, Dennis, Daniel, Duncan, Antony, Grace, David, Peter, Ms, Sam, Ann, Joe, Eva, Hez, Mary, Anne, Amos, Paul, Lucy, Jane, John, Obed, Mumbi, Sammy, Susan, Suzz-Anne, Serah, Alice, Chege, George, and Gloria