Last name Karuba (Karuba 
) , in all the world, is a rare surname. The family name Karuba is habitual in Nigeria, where it is a very rare surname, India, and South Africa, where it is an extremely rare surname. In absolute terms, it most frequently occurs in India, Nigeria, and the United States. Likewise, Karuba is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Karuba | South Africa, Poland, United States, India, Nigeria |