Throughout the world, Wanjau (Wanjau 
) is an extremely rare female forename. Much more frequently, Wanjau is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Wanjau | United Arab Emirates, United States, China, Kenya, South Africa |
| gakaara wanjau Kenyan writer, KE (b. 1921) |
|
Mr, Essy, Eric, Maina, Moses, Mercy, Sarah, Sammy, Shiro, Simon, Susan, Steve, Alice, Allan, Agnes, Chris, Carol, Caine, Cyrus, Betty, Bilal, Bilha, Nick, Judy, Jeff, Joel, Ms, Ann, Ray, Ian, Mary, Mark, Mike, Shem, Alex, Anne, Byron, Carl, Paul, Raph, Rose, Ruth, Ruta, Leah, Lucy, Jane, John, Joan, Boni, and Katho